Level 1

When rounding to the nearest ten, look at the ones digit.

If the digit is below 5 (0, 1, 2, 3 or 4) we round down

If the digit is 5 or higher (5, 6, 7, 8 or 9) we round up.

Have a look at how the numbers below have been rounded up and down:

21 - Round down to 20

16 - Round up to 20

42 - Round down to 40

97 - Round up to 100

53 - Round down to 50

35 - Round up to 40

Let's practise estimating the product.

Question

Round the first factor to the nearest ten, then multiply.

16 x 2

Solution

16 - Round to 20

Multiply 20 x 2 = 40

The answer is 40.

Are you ready to start the activities? Let's go!