Cogito
Grade 2 Math · Chapter 6 · Lesson 7
Equal Groups in Stories
Spot the equal groups hiding in a word problem.
10 problems · about 13 minutes · 2.OA.C.4, 2.OA.A.1
What this lesson teaches
The child solves word problems involving equal groups and arrays within 25.
- Find the number of groups and the size of each.
- Check that the groups really are equal.
- Then add the group size once per group.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
2 problemsReview — Filling a Rectangle With Squares: 2 rows of 5 squares. How many squares?
Answer 10
Why 2 rows of 5 is 10 squares.
Review — Writing the Equation: 3 rows of 4. What is the total?
Answer 12
Why 3 rows of 4 is 12.
Warm Up
Straightforward practice. Get the method working first.
3 problems4 plates with 3 buns each. How many buns?
Answer 12
Why 3 + 3 + 3 + 3 = 12.
Which word tells you the groups are equal?
Answer "Each".
Why "Each" means every group is the same.
2 shelves with 5 books each. How many books?
Answer 10
Why 5 + 5.
Build It Up
The same ideas with more to keep track of.
1 problem4 tables with 4 chairs each. How many chairs?
Answer 16
Why 4 four times.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
4 problems5 bags with 3 marbles each. How many marbles?
Answer 15
Why 3 five times.
The Fruit Bowl: 3 bowls each hold 4 apples. How many apples are there?
Answer 12 apples
Why 4 + 4 + 4 = 12.
The Garden: A garden has 5 rows with 5 plants in each. How many plants?
Answer 25 plants
Why 5 rows of 5 is 25.
Not Equal: One box has 3 pens and another has 5. Can you use repeated addition?
Answer No. The groups are not equal.
Why You would simply add 3 + 5 instead.