New
New
Year 5

Round a decimal number with hundredths to the nearest whole number

I can round a decimal number with hundredths to the nearest whole number

New
New
Year 5

Round a decimal number with hundredths to the nearest whole number

I can round a decimal number with hundredths to the nearest whole number

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Lesson details

Key learning points

  1. Identify the next and previous whole numbers to the number being rounded.
  2. Identify which whole number is nearest to the number being rounded.
  3. If the value of the tenths is 5 or greater then round up to the next whole number.
  4. If the value of the tenths is less than 5, ignore the tenths and round down to the whole number.
  5. To round a number with hundredths to the nearest whole number, you only need to look at the tenths.

Common misconception

Pupils may mistake the previous multiple of one for example: previous multiple of 6.38 being 5.

Ensure pupils are given plenty of opportunities to place numbers on number lines, identifying the previous and next multiples of one.

Keywords

  • Multiple - A multiple is the result of multiplying a number by an integer. For example 2 × 5 = 10 so 10 is a multiple of 2 and 5.

  • Previous - Something that comes before something else is known as the previous thing.

  • Next - Something that comes after something else is known as the next thing.

  • Rounding - Rounding means making a number simpler but keeping its value close to what it was.

Ensure you build towards pupils generalising for themselves and that they look at the column to the right of the place value they want to round towards. Rounding the same number to different place values can help with this.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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6 Questions

Q1.
Which numbers are multiples of 1?
Correct answer: 7
4.4
3.93
Correct answer: 20
Q2.
What is the missing number in the sequence?
An image in a quiz
Correct Answer: 4.2, 4.20
Q3.
Match the number to the correct letter on the number line.
An image in a quiz
Correct Answer:2.4,A

A

Correct Answer:4.2,B

B

Correct Answer:7.4,C

C

Correct Answer:7.9,D

D

Q4.
What are the closest multiples of one that 6.38 sits between?
5 and 7
Correct answer: 6 and 7
6.3 and 6.4
6.3 and 7
Q5.
What is 9.97 rounded to the nearest multiple of 0.1?
Correct Answer: 10, ten, 10.0
Q6.
What is 9.9 rounded to the nearest multiple of 1?
Correct Answer: 10, ten, 10.0

6 Questions

Q1.
What are the closest multiples of one that 3.29 sits between?
2 and 3
Correct answer: 3 and 4
3.2 and 3.3
3.9 and 4
Q2.
Tick the statements that are correct about the number 4.56
Correct answer: It is between 4 and 5
The nearest multiple of one is 4
Correct answer: It is 44 hundredths away from 5
Correct answer: It is 56 hundredths away from 4
Q3.
What is 6.50 rounded to the nearest multiple of 1?
An image in a quiz
Correct Answer: 7, seven
Q4.
Tick the numbers that would round to the previous multiple of one, in this case 8.
An image in a quiz
Correct answer: 8.01
Correct answer: 8.38
Correct answer: 8.09
8.90
8.5
Q5.
A bag of sweets weighs 45.41 g. How much does the bag weigh to the nearest gram? g
Correct Answer: 45, 45g, 45 grams, 45grams
Q6.
Sam eats 5 sweets from a bag. The bag now weighs 32.51 g. How much does the bag weigh to the nearest gram? g
Correct Answer: 33, 33 g, 33 grams , 33grams