Ctrl+k

Find a missing group size

This skill involves determining how many objects are in each equal group when the total quantity and number of groups are known, interpreting the situation as a missing factor in a multiplication equation (for example, 3 × ? = 12) or as a division equation (12 ÷ 3 = ?). Equal-group drawings, arrays, and bar models represent these inverse relationships for whole-number quantities within 100; fractions, remainders, and larger or more generalized division are beyond this scope.

Detailed Explanation: Find a missing group size

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

Example

There are 12 apples placed into 3 equal groups. How many apples are in each group?

  1. The total is 1212 apples.
  2. There are 33 equal groups.
  3. Share the apples equally:
12÷3=412 \div 3 = 4

So, each group has 4 apples.

You can also show this with multiplication:

3×?=123 \times ? = 12

Since 3×4=123 \times 4 = 12, the missing group size is 44.

Answer: Each group has 4 apples.

Learn by doing: Find a missing group size

Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill

    Practice with unlimited practice problems

    Division Car Model - Total and Car Count to Per Car - No Remainder (2 Digit)

      ?