Finding the Number of Groups
Finding the Number of Groups is a Grade 3 math skill from Eureka Math covering quotative (measurement) division—where you know the total and the size of each group and need to find how many groups exist. The equation is: Total ÷ Size per Group = Number of Groups. For example, 18 ÷ 3 = ? asks how many groups of 3 are in 18. Third graders model this with objects or drawings, building the second core meaning of division alongside partitive (fair-share) division.
Key Concepts
Division can be used to find the number of groups when you know the total amount and the size of each group. The equation is: $$Total \div \text{Size per Group} = \text{Number of Groups}$$.
Common Questions
What is Finding the Number of Groups in division?
This is quotative division: you know the total and the size of each group, and you find how many groups can be formed. Equation: Total ÷ Size per Group = Number of Groups.
How is finding the number of groups different from fair-share division?
In fair-share division, you know the number of groups and find the size per group. In finding the number of groups, you know the size per group and find how many groups fit in the total.
Give an example of finding the number of groups.
If you have 20 apples and put 5 in each basket, how many baskets do you need? 20 ÷ 5 = 4 baskets. The size per group (5) is known; the number of groups (4) is found.
How can you model Finding the Number of Groups?
Draw the total objects and circle groups of the given size until all objects are grouped. Count the circles. That count is the number of groups.
In which textbook is Finding the Number of Groups taught?
This skill is taught in Eureka Math, Grade 3.