1.7.3

Estimations

Test yourself

Estimations

We can make estimations by rounding numbers before we do calculations. Estimate the cost of 3 train tickets which cost £4.95 each. Estimate the cost of 3 train tickets which cost £6.03.

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Example 1

  • This is hard to do in your head.
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Example 1

  • We round 4.95 to the nearest whole number.
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Example 1

  • Overestimate.
    • This answer is an overestimate because we rounded up before multiplying.
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Example 2

  • This is hard to do in your head.
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Example 2

  • We round 6.03 to the nearest whole number.
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Example 2

  • Underestimate.
    • This answer is an underestimate because we rounded down before multiplying.

Jump to other topics

1Number

1.1Place Value

1.2Factors & Multiples

1.3Operations

1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units

1.7Accuracy

2Algebra

3Ratio, Proportion & Rates of Change

4Geometry & Measures

5Probability

6Statistics

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