A class has 9 packs of cookies with 8 cookies in each pack. How many cookies are there in total?

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Multiple Choice

A class has 9 packs of cookies with 8 cookies in each pack. How many cookies are there in total?

Explanation:
Using multiplication to find total when you have multiple equal groups. If there are nine packs and each pack has eight cookies, multiply to get the total: 9 × 8 = 72. You can also see it as adding eight cookies nine times, which also sums to 72. A quick check uses the idea that 8 × 9 equals (8 × 10) − 8 = 80 − 8 = 72. The other numbers would come from counting a different number of packs (for example, ten packs would be 80, eight packs would be 64, eleven packs would be 88), so the total is 72.

Using multiplication to find total when you have multiple equal groups. If there are nine packs and each pack has eight cookies, multiply to get the total: 9 × 8 = 72. You can also see it as adding eight cookies nine times, which also sums to 72. A quick check uses the idea that 8 × 9 equals (8 × 10) − 8 = 80 − 8 = 72. The other numbers would come from counting a different number of packs (for example, ten packs would be 80, eight packs would be 64, eleven packs would be 88), so the total is 72.

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