Cogito
Grade 1 Math · Chapter 8 · Lesson 6
Tape Diagrams for Stories
Draw a story as two bars and the whole they make.
10 problems · about 13 minutes · 1.OA.A.1
What this lesson teaches
The child represents put-together and add-to story problems with a tape diagram and identifies the unknown.
- A tape diagram shows two parts and the whole.
- The parts sit end to end above the whole.
- The striped bar is what the story is asking for.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Making the Next Ten: 29 + 5 = ?
Answer 34
Why 30 and 4 more is 34.
Review — Adding Ones Without Making a New Ten: 31 + 6 = ?
Answer 37
Why 1 one and 6 ones is 7 ones.
Review — Adding Tens to Any Number: 16 + 20 = ?
Answer 36
Why 1 ten and 2 tens is 3 tens, with 6 ones.
Review — Subtracting Tens From Tens: 30 − 20 = ?
Answer 10
Why One ten is left, which is 10.
Warm Up
Straightforward practice. Get the method working first.
3 problemsParts of 13 and 12. What is the whole?
Answer 25
Why 13 + 12 = 25.
Where does the whole go on the diagram?
Answer On the bar underneath.
Why The whole is the long bar underneath.
Parts of 15 and 10. What is the whole?
Answer 25
Why Join the two bars.
Build It Up
The same ideas with more to keep track of.
1 problemParts of 21 and 7. What is the whole?
Answer 28
Why Ones go with ones.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsParts of 20 and 20. What is the whole?
Answer 40
Why 2 tens and 2 tens.
In the Fruit Bowl: 14 red apples and 6 green apples. How many in all?
Answer 20 apples
Why 14 + 6 = 20.