Mathematics / Year 5 / Number and Algebra / Number and place value

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Curriculum content descriptions

Use estimation and rounding to check the reasonableness of answers to calculations (ACMNA099)

Elaborations
  • recognising the usefulness of estimation to check calculations
  • applying mental strategies to estimate the result of calculations, such as estimating the cost of a supermarket trolley load
General capabilities
  • Numeracy Numeracy
ScOT terms

Rounding,  Accuracy and precision

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4 direct matches to ACMNA099 | 1 other related resources

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MathXplosion, Ep 16: It's an estimate, not a guess!

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An approximation is the nearest estimate without having the precise size or measurement of something. See how accurate estimates are made in logical ways using information about many things in our everyday lives.

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MathXplosion, Ep 5: Measure a tree without using a ladder

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What do you do when you need to measure a length, height or distance but don't have a ruler or some other measuring instrument? You can compute linear measurements with surprising accuracy using indirect measurements, proportions and estimations. Learn a nifty trick to measure a tree from a distance.

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MathXplosion, Ep 3: How many heads tall are you?

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What are non-standard measurement units? Did you know we can reliably use objects in the real world, including our own body parts, to measure things? This concept of anthropometry, the ratios of body measurements, was first proposed by Leonardo da Vinci.

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Video

Mixed Up Maths, Ep 6: Maths saves lives

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Can maths really help to save lives? In this clip we see some real life applications of mathematics. Some are about helping to save lives others are about how maths can be useful. What do Florence Nightingale and WHO, the World Health Organisation have in common?

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Video

Rounding whole numbers: 2

  • TLF-IDM011490

This is a video demonstration of rounding a whole number to the nearest thousand. In the commentary, the presenter explains the thinking behind the process of rounding such numbers and presents a visual representation of rounding whole numbers using a number line. Practice questions with answers are included, and hints ...

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