Examples of Oral and Mental Starters

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Examples of Oral and Mental Starters
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Think of a number...

• Think of an integer between 1 and 9.
• Multiply by 2.
• Add 5.
• Multiply by 50.
• Add 1753 if your birthday has passed...
• Add 1752 if your birthday hasnt .
• Subtract your year of birth.

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Multiplication makes bigger
Discuss the truth of the statement
Multiplication makes bigger. Is it
always, sometimes or never true?
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Problem solving
What is one mark worth as a percentage?
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Tables in code
G x C BG J x C AF H x C JD I
x C DG B x C C C x C AC E x C
DE A x C BE D x C GD
Each letter stands for the same number every
time it appears. The table is not written out
in order from 1x up to 9x. Which times table is
this? What number does each letter represent?
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Target boards
1¼ 2¾ ¾ 2¼
1½ ½ 1 3
2½ 1¾ ¼ 2
How many ways can you find to make 3?
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Complete the FDP Wall




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Think carefully about these
What could come next? Tell your partner and
justify your choice. M, T, W, T, F, . .
. 3, 3, 5, 4, . . . 1, 1, 2, 3, . . .
1, 5, 25, 125,
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How well can you estimate? - Game
13.34 54 121.6 64
49 63.7 39 2584
3111 61 1349 6.7
31 3136 3.8 2499
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How well can you estimate?
These are the calculations
371.2 5.8
5130 95
1421 29
2769 71
44.89 6.7
1769 29
345.8 91
2511 81
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Algebra grid
Let a 1, b 2, c 3.   Complete the grid
below with algebraic expressions that give the
values in the top grid.
Possible Extensions Use all 3 letters in each
term. Use different values eg d 4, e 8, f
3. At least 5 must include division
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Addition squares in number and algebra
Simplifying collecting..
2c 3d 8c - 2d 4c
5d 3c d

1.
6c 8d 12c 3d 5c 4d 11c - d
5p - 8q

p - 7q
2.
3p 4q 4p - 3q 3q - 5p 2q
- p
8p - 4q
10q - 6p
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Addition squares in number and algebra How many
solutions?
3.
3a 5b
5a 3b 2a 7b 4a
5b
3a 5b - x 5a 3b - x

x
x - a 2b
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Visualisation 1
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Visualisation 2
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Duals?
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Duals?
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Perimeters
The perimeter of a triangle is 48 cm. The length
of the shortest side is x cm and the length of
one of the other sides is 2x cm. Prove that 8 lt
x lt 12.
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Try this starter !
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Washing Up
Give a plausible explanation for the shape of
this graph.
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(No Transcript)
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Probing questions a starting point

• How do you know? What do you look for?
• How do you go about ?
• What clues do you use when?
• Make up some question that
• Give me a that is the same as How did you do
  it?
• Present a statement and ask- Is it always
  true?- Why is it false?