Mathematics

Intermediate

50 mins

Teacher/Student led

Learning Goals

Learning Outcomes

Lesson Files

+80 XP

What you need:
IWB/Projector/Large Screen

Rounding Decimals to the Nearest Whole, Tenth and Hundredth

Learn to round decimals to the nearest whole number, tenth, or hundredth using the round-half-up rule. Identify the two candidate values and use the deciding digit to determine which one is closer.

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1 Getting Started
2 Watch and Notice
3 Try It Together
4 Sketch the Candidates in Your Copy
5 Class Challenge
6 What Did We Notice?
7 What's Next
Pupil practice

1 - Getting Started ~4 mins

Key point

Illustration for Getting Started A GAA player's kick travelled 4.7 metres. The match report only wants whole metres. Is that a 4 metre kick or a 5 metre kick? Hands up: which one, and how did you decide?

👇 Mark your steps as done as you complete them.

+5 XP

2 - Watch and Notice ~9 mins

Each number line zooms in on the two values our number sits between. Watch where the marker lands, and decide which end it is closer to. Look out for the deciding digit each time.

👇 Mark your steps as done as you complete them.

+10 XP

3 - Try It Together ~11 mins

What you'll do

Let's round some numbers together on the board. On screen you can see 0.62 sitting on a line from 0.6 to 0.7. Which candidate is it nearer to, 0.6 or 0.7? Say why, then we agree the rounded value together. After that I will change the line to 9 to 10 for 9.5, and then to 1.3 to 1.4 for 1.34, and we round each one the same way.

Round it together

+15 XP

4 - Sketch the Candidates in Your Copy ~2 mins

COPYBOOK MOMENT

In your maths copy, sketch a short number line for each rounding example and mark both candidate numbers, one at each end. Put a dot where the decimal sits, then circle the candidate it rounds to.

0.62 to the nearest tenth (candidates 0.6 and 0.7)
9.5 to the nearest whole (candidates 9 and 10)
1.34 to the nearest tenth (candidates 1.3 and 1.4)

+10 XP

5 - Class Challenge ~8 mins

Watch out

Rounding up can fill the tenths completely and carry into the ones, so the answer may jump past every mark on the tenths line. Look out for that twist on the last challenge.

Here's today's challenge, and each one adds a little twist: round 0.62 to the nearest tenth, then 1.275 to the nearest hundredth, then 9.5 to the nearest whole, and finally 9.95 to the nearest tenth.

Round to the target place

+15 XP

Pupil practice

Module 1 · Place Value and the Decimal Number System Number

Lesson 8 · Rounding Decimals to the Nearest Whole, Tenth and Hundredth

Download Activity Book page (PDF)

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