igsce maths multiply a positive by negative number

1
multiply positive number by a negative number
using a number line
2
in this lesson
we show how to multiply a positive by a negative
number using a number line
you also do an exercise multiplying a positive
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
7 x - 3
examples
-ve
ve
move 7 steps
step size -3
move backward
facing positive
- 21
7 x - 3
answer from number line
5
4 x - 3
examples
ve
-ve
move 4 steps
step size -3
move backward
facing positive
- 12
4 x - 3
answer from number line
6
lets do together
7
examples
2 x - 4
-ve
ve
move 2 steps
step size -4
move backward
facing positive
- 8
2 x - 4
answer from number line
8
examples
5 x - 2
ve
-ve
move 5 steps
step size -2
move backward
facing positive
- 10
5 x - 2
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
we evaluated and got the following
1.
2.
3.
4.
5.
6.
12
working
1.
-ve
ve
step size -2
move 4 steps
move backward
facing positive
- 8
4 x - 2
answer from number line
13
working
2.
-ve
ve
step size -4
move 4 steps
move backward
facing positive
- 16
4 x - 4
answer from number line
14
3.
working
-ve
ve
step size -6
move 2 steps
move backward
facing positive
- 12
2 x - 6
answer from number line
15
working
4.
-ve
ve
step size -5
move 3 steps
move backward
facing positive
- 15
3 x - 5
answer from number line
16
working
5.
ve
-ve
step size -2
move 11 steps
move backward
facing positive
- 22
11 x - 2
answer from number line
17
working
6.
-ve
ve
step size -4
move 5 steps
move backward
facing positive
- 24
5 x - 4
answer from number line
18
summary
we showed how to multiply a positive by a
negative number using a number line
you also multiplied positive 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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