Explain how to find 4x80

Question

asked Feb 6, 2019 140k views

2 Answers

Gfbio · Answer 1 · 2019-02-07T23:23:51+0000

For this case we have the following expression:

4 * 80

To solve the following steps:

Step 1:

We rewrite the biggest multiplication factor, that is, 80:

80 = 8 * 10 , that is, ten times the number eight results in eighty.

So, we have:

4 * 8 * 10

Step 2:

We apply associative property of multiplication, which states:

a * b * c = a * (b * c) = (a * b) * c = b * (a * c)

If we have:

$a = 4\\b = 8\\c = 10$

We apply:

(a * b) * c = (4 * 8) * 10

So, first solving the product in parentheses, we have four times eight to thirty-two.

(a * b) * c = (4 * 8) * 10 = 32 * 10

In this way we can multiply by 10 which is easier.

We know that to every number multiplied by 10, a zero must be added.

(4 * 8) * 10 = 32 * 10 = 320

Answer: