Students add and subtract multiples of 10 to and from any two-digit number (RTP 2AS–3), seeing that only the tens digit changes, on 100 squares and with place-value apparatus.
Intermediate Level
Students add and subtract multiples of 10 to and from any two-digit number (RTP 2AS–3), seeing that only the tens digit changes, on 100 squares and with place-value apparatus.




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Q: 10
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