# Estimate with Whole Numbers

In this worksheet, students will use rounding to estimate calculations involving whole numbers.

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Approximation to Estimate/Calculate Answers

Difficulty level:

#### Worksheet Overview

Sometimes in everyday life, it is appropriate to use estimation when talking about numbers.

We may want to calculate an approximate answer to a problem quickly, where we don't need an exact answer.

We can use rounding to help us estimate a solution.

Rounding makes the numbers easier to calculate with, and so can often be done mentally.

Example:

A shop is selling packs of biscuits for £2.17 each. I have £9 and wonder if I have enough money to buy 4 packs.

I can round £2.17 up to £2.20, and then do 2.20 x 4 = £8.80

I rounded up, so I know it'll cost me less than £8.80, so I'll definitely have enough.

Example:

In my pizza restaurant, I make pizzas that I cut into 10 slices.

One day, I have 146 people booked into the restaurant. I know on average that people order 3 slices of pizza.

How many pizzas will I need to make to feed everyone?

I can round 146 to 150.

Then I would do 150 x 3 = 450.

I need to make 450 slices of pizza.

450 ÷ 10 = 45.

I should make around 45 pizzas.

Let's do some more estimation practice!

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