Subtraction Within 20: Grade 1 Math Worksheet – PDF Download

Grade 1 Subtraction Within 20 Worksheet: problems 1–5

Problem 1: Take away a picture

Liam had 8 grapes and ate 3. The crossed-out grapes were eaten. Write a subtraction sentence.

Problem 2: Ten frame take away

Write a subtraction sentence for the ten frame. The crossed-out counters are taken away.

Problem 3: Find the differences

Find each difference.

1. \(7-2\)
2. \(10-6\)
3. \(8-0\)
4. \(6-6\)

Problem 4: Doubles help

Use a double fact to find each difference.

1. \(10-5\)
2. \(14-7\)
3. \(18-9\)

Problem 5: Count back on a number line

Start at 12. Hop back 4 times to find \(12-4\). Write the difference.

Grade 1 Subtraction Within 20 Worksheet: problems 6–10

Problem 6: Count back

Count back to find \(15-3\).

Problem 7: Think addition with a bar

Find \(10-7\) by finding the missing part.

Problem 8: Missing addend

Write the missing number: \(9+\text{ __ }=12\). Then find \(12-9\).

Problem 9: Subtract by making a ten

Fill in the missing numbers: \(13-8=13-3-\text{ __ }=10-\text{ __ }=\text{ __ }\)

Problem 10: Fact family of three numbers

Use the numbers 6, 7, and 13 to write four number sentences.

Grade 1 Subtraction Within 20 Worksheet: problems 11–15

Problem 11: Write the missing sentence

Three sentences from a fact family are shown: \(5+9=14\), \(9+5=14\), \(14-9=5\). Write the fourth sentence.

Problem 12: Use a related fact

Sofia knows \(8+7=15\). Use it to find \(15-7\) and \(15-8\).

Problem 13: Missing numbers

Write the missing number.

1. \(16-\text{ __ }=9\)
2. \(11-\text{ __ }=5\)
3. \(\text{ __ }-3=8\)

Problem 14: Circle the sixes

Circle the subtraction sentences that equal 6: \(14-8\), \(15-8\), \(13-7\), \(12-5\).

Problem 15: Mixed differences

Find each difference.

1. \(16-8\)
2. \(17-10\)
3. \(15-9\)
4. \(19-4\)

Grade 1 Subtraction Within 20 Worksheet: problems 16–20

Problem 16: Cubes: how many more?

Mei has 9 blue cubes. Jamal has 5 green cubes. How many more cubes does Mei have than Jamal?

Problem 17: Grapes

Aisha had 15 grapes. She ate 6 grapes. How many grapes are left?

Problem 18: Stickers given away

Priya had 14 stickers. She gave some stickers to a friend. Now she has 8 stickers. How many stickers did she give away?

Problem 19: Cards: how many fewer?

Liam has 12 baseball cards. Sofia has 7 baseball cards. How many fewer cards does Sofia have than Liam?

Problem 20: Fish in a tank

A tank has 13 fish. Eight fish are orange. The rest are yellow. How many fish are yellow?

Grade 1 Subtraction Within 20 Worksheet: problems 21–22

Problem 21: Crackers

Noah had some crackers. He ate 4 crackers. Now he has 9 crackers. How many crackers did he have at first?

Problem 22: Pencils for friends

Diego had 19 pencils. He gave 6 pencils to Mei. He gave 5 pencils to Jamal. How many pencils does Diego have left?

How to use this grade 1 subtraction within 20 worksheet

Print this grade 1 subtraction within 20 worksheet as a PDF, solve every problem on paper, then compare with the answer key.

See every chapter on the Grade 1 math page.