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- Measurement and space
- Number and algebra
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Six demonstrations, free to try.
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Newton's second law: what decides how quickly a cart speeds up?
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How a lesson runs.
One sample lesson, from watching to working on your own. Try one of its questions: choose an answer, check it, or ask for a hint.
- Get readyCheck tens and ones first
- Watch52 + 36, worked by splitting
- Together43 + 20 bottle tops
- With help41 + 37, step by step
- On my own14 questions, three hints each
- Error review5 common errors to look out for
On my own · Question 13 of 14
Rhea works out 43 + 20 and writes 65. Which of these is her mistake?
Common error
Check the right answer and this card names the mistake the question looks for, with its fix.
Changing the ones digit when only tens were added
43 + 20 answered as 65 or 45.
Fix. Say which column the added number lives in before adding. Twenty is two rods and no cubes, so the cubes cannot change. Compare the block model with the written calculation and revisit the distinction during later practice.
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