One stroke per sentence: draw a bar model to sort out how the unknowns relate, then move step by step to shorter symbols.
Relationships between Unknowns: Elimination
Methods in this video
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- 1
Line up two rows, cross out what's the same
When to use it: The question gives two totals (such as two weighings, two prices, or the two sides of a balance) that share some of the same things, but doesn't say what each thing weighs or costs.
- Write the two totals as two rows, lined up.
- Cross out what both rows share; what is left gives the key relationship (like 6 plates = 4 bowls).
- It is the same idea as a balance: take the same thing off both sides and it still balances.
Practise exam-style questions with these methods
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