First box = 90m
Second box = 3
Third box = 90m + 27
The given expression is:
9 (10m + 3)
The expression 9(10m + 3) can be splitted into:
9(10m) and 9(3)
9(10m) = 90m
9(3) = 27
9 (10m + 3) = 90m + 27
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