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Summaries · Grade 5 Maths › Rounding off
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Rounding off

Rounding to the nearest 10, 100 or 1 000, and estimating to check your answer. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Rounding to the nearest 10, 100 or 1 000

01020304050607080901004747 is closer to 50 than to 40
47 rounds to 50
  1. Look at the digit to the right of the place you are rounding to.
  2. 0, 1, 2, 3 or 4: round down (the digit stays).
  3. 5, 6, 7, 8 or 9: round up (the digit goes up by one).
  4. All the digits to its right become zeros.
NumberNearest 10Nearest 100Nearest 1 000
4 3524 3504 4004 000
7 8657 8707 9008 000
Tap when you could tell someone without looking.

Estimating

Round first, then calculate: 398 + 512 ≈ 400 + 500 = 900. This tells you roughly what the answer should be.

Reverse rounding: which numbers round to 50 (nearest 10)? All numbers from 45 to 54.

  • Go half a step back, and up to just under half a step forward.
  • Rounds to 300 (nearest 100): 250 to 349. The smallest number is 250 and the biggest is 349.
  • Rounds to 4 000 (nearest 1 000): 3 500 to 4 499.
  • Rounds to 35 (nearest 5): 33, 34, 35, 36 and 37.
Tap when you could tell someone without looking.

Rounding to the nearest 5

Look at the last digit: 1 or 2 goes down to 0, 3 or 4 goes up to 5, 6 or 7 goes back to 5, and 8 or 9 goes up to 10.

Round 3 487 to the nearest …Answer
53 485
103 490
1003 500
1 0003 000
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Remember this and test yourself

Remember this: your summary
  • Look at the digit to the right of the place.
  • 0 to 4 rounds down; 5 to 9 rounds up.
  • The digits on the right become zeros.
  • Estimate by rounding first.

Write these points in your book. Read them again the night before the test.

Memory trick

Five or more, raise the score; four or less, let it rest.

Flash cards · Tap to turn over

Important words

First say the answer yourself, then turn the card over.

Now the real quiz!

The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.

Take the quiz: Rounding off
Practise it step by step: Extra Maths ClassAll Grade 5 Maths summaries
For parents
  • Let your child work the examples on paper and explain them to you.
  • The ticks (“I know this”) are saved on this device only. We never ask for names or emails.

Follows CAPS for Grade 5 Mathematics. Always check your teacher’s notes and textbook too.

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