CALCULATOR ACTIVITIES

1
CALCULATOR ACTIVITIES
2
(No Transcript)
3
Your teacher will read some data for you to feed
into your calculator.
Follow the instructions carefully and see if your
answer matches the one given
The following slides give you the solutions.
CALCULATOR ACCURACY
4
Calculator accuracy 1
Add together the following numbers
One hundred and nine
109
Two thousand and fifty
2050
2159
Sixty-seven
67
2226
Twelve thousand and forty-four
12044
14270
Seven hundred and thirty
730
Final answer
15000
5
Calculator accuracy 2
Add together the following numbers
Twenty-two point two
22.2
Nought point nought two
0.02
22.22
Two point two
2.2
24.42
Nought point two
0.2
24.62
Two hundred and two
202
Final answer
226.62
6
Calculator accuracy 3
Add together the following numbers
A quarter of 500
125
10 of 250
25
150
Double 45
90
240
Three quarters of 200
150
390
One tenth of 100
10
Final answer
400
7
Calculator accuracy 4
Follow the following instructions
Key in one thousand
1000
Divide by forty
40
25
Multiply by seventeen
X 17
425
Add seventy-five
75
500
Double your answer
X 2
Final answer
1000
8
WITH ACKNOWLEDGEMENTS TO The National Numeracy
Strategy
ACTIVITIES FOR YEARS FIVE AND SIX
9
WORDS
Each person in the group should have a calculator.
One person in the group reads out the numbers
from the list. Leave a suitable time gap between
each number. The rest of the group enter them
into the calculator pressing the key after
each one
Check to see if the children reached the correct
answer.
10
WORDS LISTS
SET 1
SET 2
One hundred and fifty-six Two hundred and
seven Seven hundred and five Three hundred and
twelve Six thousand one hundred One thousand and
eighty
Forty-three Eighty-six Ninety Eighteen Thirty-nine
Fifty-seven
43
156
86
207
90
705
18
312
39
6100
57
1080
333
8560
ANSWER
NEXT
ANSWER
NEXT
11
WORDS LISTS 2
SET 3
SET 4
One pound fifty Four pounds, ten Two pounds and
six pence Forty pence Three pounds
ninety-nine Eight pence
One and a quarter Three-tenths Two
hundredths Three-quarters Two fifths A half
1.25
1.50
0.3
4.10
0.02
2.06
0.75
0.40
0.4
3.99
0.5
0.08
3.22
12.13
ANSWER
NEXT
ANSWER
12
Using only the numbers below and the sign on
your calculator 47 17 39 23 38 Complete
the number sentences.
TRIPLES
13
Using only the numbers below and the sign on
your calculator 47 17 39 23 38 Complete
the number sentences.
109
78
124
103
102
ANSWER
14
Using only the numbers below and the sign on
your calculator 47 17 39 23 38 Complete
the number sentences.
109
39
47
23
78
23
17
38
124
38
39
47
103
39
17
47
102
47
38
17
Numbers may be in any order
ANSWER
15
SIX KEYS
Use just six keys to get 20 in the display.
For example
3
4
-
1

4
20
4

9


7
20
1
8
0


9
20
More examples
16
SIX KEYS
3
4
-
1

4
20
4

9


7
20
1
8
0


9
20
5

20
x
5
-
5

20
8

2
x
5

20
6

4
x
2
You may have found many more ways to do this
17
Use only the numbers from the list below
149 217 269 282 306
Fill in the boxes to make the number sentences
correct.
NEXT
BOXES
18
Use only the numbers from the list below
149 217 269 282 306
Fill in the boxes to make the number sentences
correct.
a
-

68
f


431
b
g
-

55


486
c


588
h
-

37
d
-

157
i


523
-
65

418
e

j

NEXT
19
Use only the numbers from the list below
149 217 269 282 306
Fill in the boxes to make the number sentences
correct.
a
-

68
f


431
217
149
149
282
b
g
-

120


486
269
149
217
269
c


588
h
-

37
282
306
306
269
d
-

157
i


523
306
149
217
306
-
65

418
282
217
149
269
e

j

ANSWERS
Answers in yellow boxes may be reversed
20
CALCULATOR NIM
A game for two players sharing a calculator
You may use only these keys
1
2
3
4
5
6
7
8
9


Take turns to add a single-digit number to what
is already in the calculator.
The winner is the player who makes the display
show 30
If you go over 30 you lose.
Examples
21
CALCULATOR NIM EXAMPLES
9

5

14

9

23

7

30
6

6

12

9

21

9

30
Variations
Choose a different target number.
Make the target 250 and add 2-digit numbers
Use subtraction. Start by entering a number and
state the target number. E.g start at 70.
Target number 18
Play the game using multiplication. Enter 1 and
set a target such as 1000
22
ONE, ZERO, FIVE
Use only these keys on your calculator
1
0
5


Make each of the numbers by pressing as few keys
as possible
Record how you did it.
NEXT
23
ONE, ZERO, FIVE
Use only these keys on your calculator
1
0
5


Make each of the numbers by pressing as few keys
as possible
Record how you did it.
16
37
88
638
NEXT
24
ONE, ZERO, FIVE
Use only these keys on your calculator
1
0
5


Make each of the numbers by pressing as few keys
as possible
16
1
5

1

1
6
5
37
1
5

1
5

5

1

1

3
7
12
88
5
5

1
1

1
1

1
1

8
8
12
Use other numbers and digit keys
ANSWERS
25
MAKE 1000
Choose any four numbers from the grid and add
them up so that the total is 1000.
275
382
81
174
206
117
414
262
483
173
239
138
331
230
325
170
NEXT
26
MAKE 1000
Choose any four numbers from the grid and add
them up so that the total is 1000.
Choose any four numbers from the grid and add
them up so that the total is 1000.
275
382
81
174
174
275
81
382
206
117
414
262
206
414
117
262
483
173
239
138
138
483
173
239
331
230
325
170
331
325
170
230
There are numerous combinations. Here are some
examples.
Examples
27
ONLY ONE NUMBER
17 can be changed into 1 by using only the number
4 key, together with any of the operation keys.
For example
17 x 4 68 - 4 64 4
16 4 4 4 1
Try again using other operations and other
starting numbers.
NEXT
28
ONLY ONE NUMBER
17 can be changed into 1 by using only the number
5 key, together with any of the operation keys.
For example
17 - 5 12 - 5 7 - 5
2 x 5 10 - 5 5
5 1
17 x 3 51 - 33 18 3
6 - 3 3 3 1
Or 3?
Try again using other operations and other
starting numbers.
What did you discover?
29
MISSING OPERATIONS
In the number sentences each box represents a
missing operation . -, x or .
Can you find out what it is in each case?
NEXT
30
MISSING OPERATIONS
In the number sentences each box represents a
missing operation . -, x or .
Can you find out what it is in each case?
37 21 223 1000
a
b
756 18 29 1218
c
27 36 18 675
d
31 87 19 2108
NEXT
31
MISSING OPERATIONS
In the number sentences each box represents a
missing operation . -, x or .
Can you find out what it is in each case?
37 21 223 1000
a
x

b
756 18 29 1218

x
c
27 36 18 675

x
d
31 87 19 2108
-
x
ANSWERS
32
BROKEN CALCULATOR
The calculator is broken. Only the keys shown work
x
5
6
-
2

Use just these keys. Can you make every number
from 1-25?

NEXT
33
BROKEN CALCULATOR
The calculator is broken. Only the keys shown work
x
Use just these keys. Can you make every number
from 1-25?
5
6
-
2

6
-
5

1

6
-
2
-
2

2
5
-
2

3
5

2

2

9
6
-
2

4
5

5

10
5

5
-
5

5
5

6

11
6
-
6

6

6
2
x
6

12
5

2

7
6

5

2

13
2

6

8
Examples
34
BROKEN CALCULATOR 2
The 6 key on your calculator is broken. Find ways
to use your calculator to do the calculations
below. Think about your strategy for each one
before trying it on your calculator. The six will
display on the screen.
32 16 126 x 58 48 x 6 146 7 62 x
16 263 - 76
NEXT
35
BROKEN CALCULATOR 2
The 6 key on your calculator is broken. Find ways
to use your calculator to do the calculations
below. There may be more than one solution.
32 16 126 x 58 48 x 6 146 7 62 x
16 263 - 76
32 17 -1
(127 x 58) - 58
48 x 3 x 2 or 24 x 12
(153 - 7) 7
31 x 32 124 x 8
273 - 10 - 75 - 1
ANSWERS
36
PRODUCTS
A game for two players, each with a different
coloured pen.
Take turns to choose two numbers from the list
below.
7 16 27 31 46 56 67 71
Multiply them together. Ring the answer on the
grid if you can.
The winner is the first to make four rings in a
line in any direction.
NEXT
37
PRODUCTS
A game for two players, each with a different
coloured pen.
Take turns to choose two numbers from the list
below.
7 16 27 31 46 56 67 71
Multiply them together. Ring the answer on the
grid if you can.
The winner is the first to make four rings in a
line in any direction.
506
1426
217
837
1136
3266
4757
1809
1242
3082
341
112
77
496
3752
432
176
2201
1917
736
737
189
2576
1072
616
322
896
781
3976
497
469
1512
1736
2077
392
297
38
The calculator may be used to make constants.
ENTER
1


The display will show 1
Press the key repeatedly. What do you notice?
1 is added each time
1








Will display 7
Try again using other digits. E.g. 2
What do you notice?
CONSTANTS
39
ADDING CONSTANTS GAME
Each pair of players needs a calculator.
Enter
1


Each player estimates the number of presses
they might make in 15 seconds. Record their
estimates.
Allow 15 seconds. Record the actual total.
Who scored more?
How much more or less was your estimate?
How much more or less did you score than your
partner?
What was the total of your two scores?
Repeat the activity and compare scores again.
Scores may be recorded to build a data bank for
handling data. Use axis ranges, e.g. 20-24,
25-29, 30-34, etc.
40
The calculator may be used to make constants.
ENTER
0
1
-
0
1
2



What do you notice?
The display will show 94
By repeated pressing of the key 2 will be
subtracted each time
1
0
0
-
2




Will display 92
CONSTANTS
41
The calculator may be used to make constants.
ENTER
x
1

2
The display will show 4
By repeated pressing of the key the number in
the display will be doubled each time.
2
x




Will display 32
CONSTANTS
42
The calculator may be used to make constants.
ENTER

1
2
8
2
1

The display will show 64
By repeated pressing of the key the number in
the display will be halved each time.
2

2



1
8
Will display 16
CONSTANTS
43
ON DISPLAY
The display below on the calculator screen may be
read in different ways depending on the unit of
measurement.
205.2
It could be
205.20
205 m 20 cm
205 Kg 200 g
205 minutes and 12 seconds
Complete the table to show how the calculator
display could be read
44
Reading a calculator display - complete this
table.
Money
Length m
Mass Kg
Time m sec
display
a
52.3
52.30
52m 30cm
52Kg300g
52min 18sec
b
79.75
79.75
79m 75cm
79Kg750g
79min 45sec
124.8
124.80
124m 80cm
124Kg800g
124min48sec
c
301.05
301.05
301m5cm
301Kg50g
301min3sec
d
ANSWER FOR EACH ENTRY
45
CALCULATOR ACTIVITIES
46
The following slides are blank templates for
class work.
47
Your teacher will read to you some data to feed
into your calculator.
Follow the instructions carefully and see if your
answer matches the one given
The following slides give you the solutions.
CALCULATOR ACCURACY
48
Using only the numbers below and the sign on
your calculator 47 17 39 23 38 Complete
the number sentences.
109
78
124
103
102
49
SIX KEYS
20
20
20
20
20
20
50
Use only the numbers from the list below
149 217 269 282 306
Fill in the boxes to make the number sentences
correct.
a
-

68
f


431
b
g
-

55


486
c


588
h
-

37
d
-

157
i


523
-
65

418
e

j

51
Use only the numbers from the list below
149 217 269 282 306
Fill in the boxes to make the number sentences
correct.
a
-

f


68
431
b
g
-

55


486
c


h
-

588
37
d
-

157
i


523
-

65
418
e

j

Addition boxes may be reversed
52
CALCULATOR NIM
A game for two players sharing a calculator
You may use only these keys
1
2
3
4
5
6
7
8
9


Take turns to add a single-digit number to what
is already in the calculator.
The winner is the player who makes the display
show 30
If you go over 30 you lose.
53
ONE, ZERO, FIVE
Use only these keys on your calculator
1
0
5


Make each of the numbers by pressing as few keys
as possible
Record how you did it.
16
37
88
638
54
MAKE 1000
Choose any four numbers from the grid and add
them up so that the total is 1000.
275
382
81
174
206
117
414
262
483
173
239
138
331
230
325
170
55
MISSING OPERATIONS
In the number sentences each box represents a
missing operation . -, x or .
Can you find out what it is in each case?
37 21 223 1000
a
b
756 18 29 1218
c
27 36 18 675
d
31 87 19 2108
56
BROKEN CALCULATOR
The calculator is broken. Only the keys shown work
x
5
6
-
2

Use just these keys. Can you make every number
from 1-25?

57
BROKEN CALCULATOR 2
The 6 key on your calculator is broken. Find ways
to use your calculator to do the calculations
below. Think about your strategy for each one
before trying it on your calculator. The six will
display on the screen.
32 16 126 x 58 48 x 6 146 7 62 x
16 263 - 76
58
PRODUCTS
A game for two players, each with a different
coloured pen.
Take turns to choose two numbers from the list
below.
7 16 27 31 46 56 67 71
Multiply them together. Ring the answer on the
grid if you can.
The winner is the first to make four rings in a
line in any direction.
506
1426
217
837
1136
3266
4757
1809
1242
3082
341
112
77
496
3752
432
176
2201
1917
736
737
189
2576
1072
616
322
896
781
3976
497
469
1512
1736
2077
392
297
59
Reading a calculator display - complete this
table.
Money
Length m
Mass Kg
Time m sec
display
a
52.3
b
79.75
124.8
c
301.05
d