1st Grade Subtraction Within 20 Worksheet (PDF)
This subtraction within 20 worksheet for 1st Grade covers subtraction within 20 (Common Core 1.OA.A.1, 1.OA.B.4, 1.OA.C.6), with a free PDF to print.
These 20 problems practice subtracting within 20. Students cross out counters, count back, think of a missing addend and use fact families, as in Common Core 1.OA.B.4 and 1.OA.C.6.
The first problems are quick facts. The last six are stories about taking away, comparing and finding a missing part.
Grade 1 · Common Core State Standards: 1.OA.A.1, 1.OA.B.4, 1.OA.C.6
Subtraction within 20 worksheet: exercises 1 to 10
Exercise 1 – Cross out counters
Count the counters that are not crossed out. Write the subtraction sentence.
Exercise 2 – Take away
Find \(9 – 2\).
Exercise 3 – Count back 3
Count back 3 from 12. What number do you reach?
Exercise 4 – Subtract zero
Find \(8 – 0\).
Exercise 5 – Take all away
Find \(6 – 6\).
Exercise 6 – Think addition
Find the missing number: \(4 + \text{?} = 9\). Then find \(9 – 4\).
Exercise 7 – Subtract from 14
Find \(14 – 4\).
Exercise 8 – Subtract through ten
Find \(13 – 5\). Use the frames.
Exercise 9 – Subtract 15 – 8
Find \(15 – 8\).
Exercise 10 – Fact family
Write all four facts in the fact family for 5, 7 and 12.
Exercises 11 and up
Exercise 11 – Missing addend
Find the missing number: \(6 + \text{?} = 14\).
Exercise 12 – Subtract 17 – 9
Find \(17 – 9\).
Exercise 13 – Missing part
Find the missing part.
Exercise 14 – Which is more?
How many more blue counters than orange counters are there?
Exercise 15 – Fact family gap
A fact family has the numbers 9 and 16 and a missing number. Find the third number. Then write \(16 – 9\) and its answer.
Exercise 16 – Stickers given away
Priya has 18 stickers. She gives 9 stickers to her cousin. How many stickers does Priya have left?
Exercise 17 – Shell comparison
Sofia found 15 shells at the beach. Ethan found 8 shells. How many more shells did Sofia find than Ethan?
Exercise 18 – Crayon parts
Mei has 13 crayons. 6 crayons are in the box. The rest are on the table. How many crayons are on the table?
Exercise 19 – How many more?
Jamal has 9 baseball cards. He wants 17 cards. How many more cards does Jamal need?
Exercise 20 – Find the odd one out
The numbers in a fact family are 6, 8 and 14. Which sentence does not belong? A: \(8 + 6 = 14\) B: \(14 – 6 = 8\) C: \(8 + 14 = 22\).
Key facts behind this subtraction within 20 worksheet
- The difference is the answer to a subtraction problem.
- Counting back: hop back from the whole, one number at a time.
- Think addition: 13 – 5 asks what to add to 5 to get 13.
- A fact family uses three numbers, like 8, 7 and 15.
- Subtracting 0 or the whole number gives easy answers: 6 – 0 = 6 and 6 – 6 = 0.
How to use this subtraction within 20 worksheet
Work through the exercises in order: they go from simple to challenging. Write every step on paper, then compare with the solutions page and redo any exercise you missed the next day.
All Grade 1 chapters: Grade 1 math.
