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Find a missing number of groups

This understanding involves determining how many equal groups are formed when the total quantity and the number in each group are known, representing the relationship as a division equation such as 18÷3=□18 \div 3 = \square or a related multiplication equation 3×□=183 \times \square = 18. It applies to equal-group situations and arrays with whole-number totals within 100, while distinguishing the unknown number of groups from the group size and preparing for fluent multiplication and division fact reasoning.

Detailed Explanation: Find a missing number of groups

When you know the total number and the number in each equal group, you can find the number of groups by dividing.

Example: There are 1818 apples. Put 33 apples in each bag. How many bags can be filled?

  1. The total is 1818 apples.

  2. Each group has 33 apples.

  3. Write a division equation:

18÷3=□18 \div 3 = \square

  1. Think: How many groups of 33 make 1818? Count by threes:

3, 6, 9, 12, 15, 183,\ 6,\ 9,\ 12,\ 15,\ 18

There are 66 groups.

  1. So,

18÷3=618 \div 3 = 6

You can check with multiplication:

3×6=183 \times 6 = 18

The missing number is 6\boxed{6} bags.

Learn by doing: Find a missing number of groups

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    Division Cards Model - Deck and Hand Size to Player Count - No Remainder (1 Digit)

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