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Beach Day Fact Families: Add and Subtract Within 20 worksheet preview

Worksheet

Beach Day Fact Families: Add and Subtract Within 20

Grade 1 beach day practice: use fact families and easier make-a-ten problems to add and subtract within 20, plus quick facts within 10.

Grade 1MathInteractive · Printable

Aligned to1.OA.C.6

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What’s included

  • Single worksheet
  • Auto-graded online
  • 1 Common Core standard
  • Printable answer key
  • 12 questions
  • Classroom-ready

Details

Format
Interactive · Printable
Grade
Grade 1
Subject
Math
Question types
Fill in the blank, Multiple choice, Matching, Sorting, Short answer

About this worksheet

What students practice

  • Students use fact families to connect addition and subtraction facts within 20.
  • Students change a sum into an easier problem with 10 that has the same total.
  • Students add and subtract within 10 fluently.

How to use

Use after teaching fact families. Let children use counters or a ten frame for the first section, then solve the quick facts from memory.

Curriculum

Common Core standard covered

1.OA.C.6

Add and subtract within 20 using strategies, and within 10 fluently.

Preview

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Name Date

Beach Day Fact Families: Add and Subtract Within 20

Use fact families and easier problems to add and subtract.

Seashell fact families

Each fact family uses the same three numbers. Write the missing numbers.

1.
Noah's seashell fact family uses 6, 9, and 15. Finish the four facts.

6 + 9 =  
9 + 6 =  
15 − 6 =  
15 − 9 =  

2.
Use the addition fact to solve the subtraction fact.

7 +   = 12
So 12 − 7 =  

3.
Which fact is NOT in the fact family for 4, 9, and 13?
  • A. 13 − 4 = 9
  • B. 9 + 4 = 13
  • C. 9 − 4 = 5
  • D. 13 − 9 = 4
4.
There are 14 kids at the beach. 6 kids are swimming. The rest are building sandcastles. How many kids are building sandcastles? Think: 6 + ? = 14.

14 − 6 =   kids

Make an easier problem

Move some to make a 10. Then the problem is easier to add.

5.
Mia has 9 pails and 5 shovels. Move 1 to the 9 to make 10.

9 + 5 is the same as 10 +  
So 9 + 5 =  

6.
Omar sees 8 crabs and 7 starfish. Move 2 to the 8 to make 10.

8 + 7 is the same as 10 +  
So 8 + 7 =  

7.
Match each problem to the easier problem with the same total.
  1. 9 + 7
  2. 8 + 4
  3. 7 + 6
  4. 9 + 2
  1. A. 10 + 3
  2. B. 10 + 6
  3. C. 10 + 1
  4. D. 10 + 2
8.
Kai wants to solve 6 + 8. Which easier problem has the same total?
  • A. 10 + 6
  • B. 10 + 4
  • C. 10 + 2
  • D. 10 + 8

Snack bar quick facts

Solve each fact. Try to answer the facts within 10 quickly.

9.
Each beach towel shows a fact. Sort each fact by its answer.
4 + 613 − 59 + 215 − 53 + 48 + 817 − 97 + 3
Less than 10Exactly 10More than 10
10.
Quick facts within 10.

5 + 4 =  
10 − 3 =  
6 + 2 =  
9 − 5 =  

11.
Ella brings 12 juice boxes to the beach. Her family drinks 4 of them. How many juice boxes are left?
  • A. 16
  • B. 7
  • C. 9
  • D. 8
12.
Ana says, "I know 9 + 8 = 17, so I know 17 − 8." What is 17 − 8? Tell how the addition fact helps.

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