Measurement · Length
Length and its units
Choose sensible units (mm, cm, m, km) and convert between metres and centimetres.
Victorian Curriculum VC2M4M01 · 60 questions · 2 step-by-step
How we teach it
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One question, as your child sees it
And the answer sheet that follows a second wrong try: what we know, what we need, the steps, a check, the answer.
What is the length of Willa's line, in centimetres?
Your child types the answer on a number pad.
First hint: Find Tessa's line first, take 25 mm off it, and only then change to centimetres. Write your answer as a decimal if it needs one, the way 75 mm would be written 7.5 cm.
The answer sheet
Do the millimetres first and change to centimetres last, or the numbers get muddled.
Amara's line is 65 mm.
Tessa's is TWICE as long: 65 × 2 = 130 mm.
Willa's is 25 mm SHORTER than Tessa's: 130 − 25 = 105 mm.
now change to centimetres. 10 mm make 1 cm, so 105 mm = 10.5 cm.
The question asks for centimetres, so an answer of 105 is the right length written in the wrong unit.