Number 20 Math Worksheet for Early Learners

Instructions

1. Complete each section in order. Start with the questions you know best.
2. Use counters, coins, small objects, or your fingers to help you count.
3. Read each question carefully and show your thinking when asked.
4. Check your answers in the Answer Key when you finish.

Learning goals:

• Count, read, and write numbers to 20.
• Understand tens and ones.
• Compare numbers using greater than, less than, and equal to.
• Add and subtract within 20.
• Use math in everyday situations.

1. Meet the Number 20

A. Fill in the missing numbers.

1. 16, 17, ___, 19, 20
2. 11, 12, 13, ___, 15
3. 20, 19, ___, 17, 16
4. 7, 8, ___, 10, 11
5. 14, , 16, 17,

B. Write the number.

1. ten and three = ___
2. ten and eight = ___
3. two tens = ___
4. one ten and six ones = ___
5. one ten and one one = ___

2. Tens and Ones

Remember: A number from 10 to 20 has 1 ten and some ones. The number 20 has 2 tens and 0 ones.

Complete the table.

3. Compare the Numbers

Write >, <, or = in each box.

1. 8 ___ 18
2. 20 ___ 20
3. 14 ___ 9
4. 11 ___ 16
5. 19 ___ 17
6. 6 ___ 6

Hint: The open side of the symbol faces the greater number.

4. Number Order

A. Put the numbers in order from least to greatest.

1. 12, 5, 18, 9: __
2. 20, 14, 3, 16: _____
3. 7, 19, 11, 2: __

B. Put the numbers in order from greatest to least.

1. 6, 15, 10, 20: __
2. 18, 4, 13, 9: ___

5. Add Within 20

Solve each problem. You may draw counters or use a number line.

1. 4 + 3 = ___
2. 6 + 5 = ___
3. 9 + 2 = ___
4. 7 + 8 = ___
5. 10 + 6 = ___
6. 12 + 5 = ___
7. 11 + 9 = ___
8. 13 + 4 = ___

6. Subtract Within 20

Solve each problem.

1. 8 - 3 = ___
2. 10 - 6 = ___
3. 14 - 4 = ___
4. 15 - 7 = ___
5. 18 - 9 = ___
6. 20 - 5 = ___
7. 17 - 8 = ___
8. 19 - 10 = ___

7. Math at the Market

You are helping prepare a small market basket.

Example: A basket has 6 apples and 3 oranges. How many pieces of fruit are there? 6 + 3 = 9 pieces.

Complete the table.

8. Make 20

Find a number that completes each equation.

1. 10 + ___ = 20
2. 15 + ___ = 20
3. 7 + ___ = 20
4. 20 - ___ = 12
5. 20 - ___ = 5
6. ___ + 9 = 20

Try it with objects: Place 20 counters in a group. Move some away and count how many remain.

9. Show Your Thinking

Choose one problem below. Solve it and explain or draw how you found the answer.

• 9 + 8 = ___
• 20 - 7 = ___
• Which is greater: 13 or 18? How do you know?

My work:

10. Everyday Math Challenge

A class has 20 paper cups. Students use 6 cups for a science activity and 5 cups for an art activity.

1. How many cups are used altogether? ___
2. How many cups are left? ___
3. Write a number sentence for the cups left: __

Optional Challenge

1. Write three different addition equations that equal 20.

   a. __

   b. __

   c. __

2. I am a number between 10 and 20. I have 1 ten and 4 ones. What number am I? ___

3. There are 20 birds. Some fly away, and 12 birds remain. How many birds flew away? ___

4. Create your own story problem with an answer of 20.

Answer Key

1. Meet the Number 20

A.

1. 18
2. 14
3. 18
4. 9
5. 15, 18

B.

1. 13
2. 18
3. 20
4. 16
5. 11

2. Tens and Ones

3. Compare the Numbers

1. 8 < 18
2. 20 = 20
3. 14 > 9
4. 11 < 16
5. 19 > 17
6. 6 = 6

4. Number Order

A.

1. 5, 9, 12, 18
2. 3, 14, 16, 20
3. 2, 7, 11, 19

B.

1. 20, 15, 10, 6
2. 18, 13, 9, 4

5. Add Within 20

1. 7
2. 11
3. 11
4. 15
5. 16
6. 17
7. 20
8. 17

6. Subtract Within 20

1. 5
2. 4
3. 10
4. 8
5. 9
6. 15
7. 9
8. 9

7. Math at the Market

8. Make 20

1. 10
2. 5
3. 13
4. 8
5. 15
6. 11

9. Show Your Thinking

Answers depend on the problem chosen:

• 9 + 8 = 17
• 20 - 7 = 13
• 18 is greater than 13 because 18 is farther along when counting.

10. Everyday Math Challenge

1. 11 cups are used altogether.
2. 9 cups are left.
3. 20 - 6 - 5 = 9, or 20 - 11 = 9.

Optional Challenge

1. Answers may include:
   • 10 + 10 = 20
   • 15 + 5 = 20
   • 12 + 8 = 20
2. 14
3. 8 birds
4. Answers will vary, but the total should be 20.