Students can derive number bonds to 20 using the 35 double-sided mountains (6.8cmH) by either: deriving the missing number using the sum at the top as a clue, then checking the answer on the reverse, or using the answer side to write as many related number sentences as possible using the three different numbers. 5yrs+.
Number Mountains - Addition and Subtraction to 20
SKU:
SMANS42
Number Mountains - Addition and Subtraction to 20
SKU:
SMANS42
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Number Mountains - Addition and Subtraction to 20
