Let us multiply 1-digit number using a number line.
1. Let us multiply 2 by 5 using a number line.
Take 5 jumps of 2 steps each. Where do we reach?
Start from 0. Take 5 jumps of 2 steps each. We reach 10.
2 + 2 + 2 + 2 + 2 = 10
or, 5 × 2 = 10
Now, take 2 jumps of 5 steps each. Where do we reach?
Start from 0. Take 2 jumps of 5 steps each. We again reach 10.
5 + 5 = 10
or, 2 × 5 = 10
The answer in multiplication is called the product.
So, 10 is the product of 2 and 5.
(b) Let us now multiply 2 and 10 on a number line.
Start from 0. Take 10 jumps of 2 steps each. You reach 20.
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 20
or, 10 × 2 = 20
Start from 0. Take 2 jumps of 10 steps each. You again reach 20.
10 + 10 = 20
or, 2 × 10 = 20
10 × 2 = 20 and 2 × 10 = 20
or, 10 × 2 = 2 × 10 = 20
So, 20 is the product of 2 and 10.
Changing the order of numbers being multiplied does not change the product. This means that the product remains the same even if the order of the numbers is changed.
More Example:
(i) If 2 × 10 = 20, then 10 × 2 = 20
(ii) If 5 × 2 = 10, then 2 × 5 = 10
(iii) If 2 × 4 = 8, then 4 × 2 = 8
(iv) If 3 × 10 = 30, then 10 × 3 = 30
(v) If 5 × 3 = 15, then 3 × 5 = 15
(vi) If 3 × 4 = 12, then 4 × 3 = 12
1. Multiplication using Number Lines.
(i)
2 × 4 = __________
(ii)
4 × 2 = __________
2. Multiply on the number line. One has been done for you.
(i)
4 × 5 = 20
(ii)
3 × 2 = _____
(iii)
7 × 1 = _____
(iv)
5 × 3 = _____
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