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Multiply with decimals and estimate answers

In this worksheet, students perform multiplications by rounding numbers before carrying out the calculation.

'Multiply with decimals and estimate answers' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Fractions, Decimals and Percentages

Curriculum subtopic:   Solve Rounding Problems

Difficulty level:  

Worksheet Overview

In this activity, we'll be looking at how we can multiply decimals without using a calculator to estimate the answer.


But, how do we do this?
 

Children thinking


First, we round both decimals to the nearest whole numbers, and then we simply do the multiplication sum.

 

Example:

4.11 × 8.75 =?

Here, we round 4.11 down to the whole number 4, and we round 8.75 up to the whole number 9.


(Remember, if the number after the decimal point is 5 or higher we round up, if it's a 4 or lower then we round down.)

 

So, now we have the following sum, which we can work out using our times table knowledge.

 

4 × 9 = 36

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