Students subtract two-digit numbers across a tens boundary (52 − 27) by exchanging a ten for ten ones with apparatus, or bridging back through the multiple of 10 — both routes shown, smaller-from-larger error confronted head-on.
Intermediate Level
Students subtract two-digit numbers across a tens boundary (52 − 27) by exchanging a ten for ten ones with apparatus, or bridging back through the multiple of 10 — both routes shown, smaller-from-larger error confronted head-on.




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Q: 10
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Q: 10
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Q: 10
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