Question

Use compatible numbers to find two estimates for 42 divided by 396

Answer 1

To find estimates for 42 divided by 396 using compatible numbers, round both numbers and divide to get 0.1 and 0.125.

Step-by-step explanation:

To find estimates for 42 divided by 396 using compatible numbers, we can round both numbers to the nearest ten.

42 rounds to 40 and 396 rounds to 400. Then, we can divide 40 by 400 to get an estimate of 0.1.

Alternatively, we can round 42 to 50 and 396 to 400 and divide 50 by 400 to get an estimate of 0.125.

So, two estimates for 42 divided by 396 are 0.1 and 0.125.

Answer 2

42 ÷ 396
You could use 40 ÷ 400, which would give you 0.1 as an estimate.
You could also use 42 ÷ 420, which would also give you 0.1 as an estimate.

By the way, by a pair of "compatible numbers", it means when you can easily work out the sum by calculating the first digits multiplied or divided together, then add the zeros.

For example, with 40 ÷ 400, we know that
40 ÷ 40 is 1, so we just put the other 0 infront of the decimal point to make it 0.1.

If it was multiplying (2 x 600), you could work out 2 x 6 (12), then add the 0's to get 1,200