Use the Associative Propety:

1/ Diego bought 7 sheets of stamps. Each sheet had 3 stamps per row. How many stamps did Diego buy in all ?

The answer:
7*(3*3)=
7*9=63

2/ Four children have the same birthday . At their party ,each child had 1 cake there were 8 candles on each cake. How many candles were there in all?

The answer:
4*(1*8)=
4*8=32

1 answer

looks good to me, assuming the stamp sheets had 3 rows.
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