Estimating and comparing measures · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Estimating and comparing money

Mathematics · Measurement · ages 8-9
Name ______________________   Date ____________

  1. A classroom is about 8 metres long. How many centimetres is that?

    Answer: ______________

  2. Which estimate fits a classroom length?

    • 8 metres
    • 8 centimetres
    • 8 millimetres
    • 8 kilometres

  3. Which is a good estimate for the length of a classroom?

    • 30 centimetres
    • 8 metres
    • 8 kilometres

  4. Which amount of money is greater: £2.45 or £1.30?

    £2.452.45£1.301.3
    • £2.45
    • £1.30
    • They are equal

  5. Three items cost 2.45, 1.30 and 0.75 pounds. Add the first two: what is 2.45 + 1.30?

    Answer: ______________

  6. 1200 g is heavier than 1.5 kg.

    Circle one:   True   False

  7. Which is heavier: 1.5 kg or 1200 g?

    • 1200 g
    • 1.5 kg, which is 1500 g
    • They are equal
    • Grams and kilograms cannot be compared

  8. A pupil estimates the classroom as 8 centimetres long. The teacher says the unit is wrong. Is the teacher right?

    Circle one:   True   False

  9. Mia compares £3.05 and £2.99. She says £2.99 is bigger because 99 is more than 05. What is her mistake?

    • She compared pence first, which was the correct method
    • £3.05 and £2.99 are actually equal amounts
    • She should compare pounds first: £3 is more than £2, so £3.05 is actually bigger

  10. What is the total of 2.45, 1.30 and 0.75 pounds?

    Answer: ______________

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Answer key

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Estimating and comparing money W1-mt_mFJ-2ZF6Tk-s1

  1. 800 · 800 centimetres because 1 metre is 100 centimetres and 8 x 100 = 800.
  2. 8 metres · 8 metres is correct because rooms span metres. Centimetres suit pencils, millimetres suit crumbs, kilometres suit towns.
  3. 8 metres · A classroom is about as long as a few grown-up strides, so 8 metres is sensible. A centimetre is far too small and a kilometre is far too big.
  4. £2.45 · Compare the pounds first. Since 2 is more than 1, £2.45 is the greater amount.
  5. 3.75 · 3.75 pounds because 2.45 + 1.30 = 3.75 with decimals lined up.
  6. False · 1.5 kg equals 1500 g. Since 1500 g is more than 1200 g, the statement is false.
  7. 1.5 kg, which is 1500 g · 1.5 kg, which is 1500 g is correct: 1500 beats 1200 in matching units.
  8. True · The teacher is right because 8 centimetres is pencil sized, while rooms need metres.
  9. She should compare pounds first: £3 is more than £2, so £3.05 is actually bigger · Compare the pounds first. £3 is more than £2, so £3.05 is bigger than £2.99, no matter what the pence show.
  10. 4.5 · The total is 4.5 pounds because 2.45 + 1.30 + 0.75 = 4.5.
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