igsce maths multiply a negative by a negative

1
multiply negative number by a negative number
using a number line
2
in this lesson
we show how to multiply a negative by a negative
number using a number line
you also do an exercise multiplying a negative
by a negative number using a number line
3
multiplication is a foursome process
direction of movement
direction we are facing
3.
1.
a x b
step size
number of steps
2.
4.
multiplication is a foursome
4
- 5 x - 4
examples
-ve
-ve
move 5 steps
step size -4
facing negative
move backward
- 5 x - 4
20
answer from number line
5
examples
- 3 x - 3
-ve
-ve
move 3 steps
step size -3
facing negative
move backward
- 3 x - 3
9
answer from number line
6
lets do together
7
examples
- 3 x - 4
-ve
-ve
move 3 steps
step size -4
facing negative
move backward
- 3 x - 4
12
answer from number line
8
examples
- 5 x - 2
-ve
-ve
move 5 steps
step size -2
facing negative
move backward
- 5 x - 2
10
answer from number line
9
in the next exercise
you need
a number line
10
exercises
evaluate the following
1.
2.
3.
4.
5.
6.
11
answers
evaluate the following
1.
2.
3.
4.
5.
6.
12
working
1.
-ve
-ve
move 4 steps
step size -2
facing negative
move backward
- 4 x - 2
8
answer from number line
13
working
2.
-ve
-ve
move 2 steps
step size -3
facing negative
move backward
- 2 x - 3
6
answer from number line
14
3.
working
-ve
-ve
move 3 steps
step size -5
facing negative
move backward
- 3 x - 5
15
answer from number line
15
working
4.
-ve
-ve
move 6 steps
step size -3
facing negative
move backward
- 6 x - 3
18
answer from number line
16
5.
working
-ve
-ve
move 7 steps
step size -3
facing negative
move backward
- 7 x - 3
21
answer from number line
17
6.
working
-ve
-ve
move 4 steps
step size -5
facing negative
move backward
- 4 x - 5
20
answer from number line
18
summary
we showed how to multiply a negative by a
negative number using a number line
you also multiplied negative by a negative
number using a number line
how do we multiply using a number line?
a x b
multiplication is a foursome process
a
b
give us
give us
direction we are facing
direction of movement
number of steps
step size
19
summary
we showed how to multiply two positive numbers
using a number line
you also multiplied two positive numbers using a
number line
multiplication is a foursome process
direction we are facing
direction of movement
a x b
number of steps
step size
20
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21
meaning of
see multiplication of negative number by negative
number