In this activity, we will round numbers to the nearest ten to estimate the answer to multiplication problems.

Example

Estimate the answer by rounding the numbers to the nearest 10 before multiplying.

Remember to round down if the ones are 1, 2, 3 or 4. If the ones are 5, 6, 7, 8 or 9 round up!

78 x 43

A

x

B

=

C

78 x 43

80

x

40

=

3200

Remember, to work out 80 x 40, we work out 8 x 4 x 10 x 10 = 32 x 100 = 3,200.

 Are you ready to get started?