Printable Math Worksheet for 8-Year-Olds — Numbers to 20: Missing Numbers, Spelling, Counting & Place Value

Instructions

Welcome, Number Explorer! Your mission is to solve the puzzles below. Read each section carefully and write your answers in the spaces provided. Good luck!

Part 1: Missing Numbers

Fill in the blank boxes with the missing numbers in each sequence.

1. 11, 12,  , 14, 15

2. 16, 17, 18,  , 20

3. 8, 9, 10,  , 12

4. 13,  , 15, 16, 17

5.  , 18, 19, 20

Part 2: Digits and Words

Fill in the empty parts of the table. Write the number as a digit or spell it out as a word.

Part 3: Count the Objects

Count the shapes in each group and write the total number on the line.

1. ★★★★★ ★★★★★ ★★★

   Answer: __

2. ●●●●● ●●●●● ●●●●●

   Answer: __

3. ♥♥♥♥♥ ♥♥♥♥♥ ♥♥♥♥♥♥

   Answer: __

4. â– â– â– â– â–  â– â– â– â– â–  â– â– 

   Answer: __

5. ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲

   Answer: __

Part 4: Addition on the Number Line

Use the number line to solve each problem. Start at the first number and make jumps forward.

1. 8 + 6 = __ 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

2. 11 + 5 = __ 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

3. 9 + 9 = __ 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

4. 14 + 6 = __ 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

5. 7 + 12 = __ 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

Part 5: Subtraction by Crossing Out

Cross out the correct number of shapes to find the answer.

1. 15 - 4 = __ ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●

2. 18 - 6 = __ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★

3. 12 - 5 = __ â–  â–  â–  â–  â–  â–  â–  â–  â–  â–  â–  â– 

4. 19 - 8 = __ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥

5. 14 - 9 = __ â–² â–² â–² â–² â–² â–² â–² â–² â–² â–² â–² â–² â–² â–²

Part 6: Comparing Numbers

Find both numbers on the number line. Count the jumps between them to find the difference.

1. Compare 15 and 10. The difference is _____. 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

2. Compare 19 and 11. The difference is _____. 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

3. Compare 17 and 8. The difference is _____. 0--1--2--3--4--5--6--7--8--9-10-11-12-13-14-15-16-17-18-19-20

Part 7: Tens and Ones

Break down the number in the big bubble into tens and ones. Fill in the empty bubble and the blanks.

1. Number: 14 The number 14 has one group of ( 10 ) and one group of (      ).

   That is __ ten and __ ones.

2. Number: 18 The number 18 has one group of ( 10 ) and one group of (      ).

   That is __ ten and __ ones.

3. Number: 12 The number 12 has one group of ( 10 ) and one group of (      ).

   That is __ ten and __ ones.

4. Number: 19 The number 19 has one group of ( 10 ) and one group of (      ).

   That is __ ten and __ ones.

Answer Key

Part 1: Missing Numbers

1. 13
2. 19
3. 11
4. 14
5. 17

Part 3: Count the Objects

1. 13
2. 15
3. 16
4. 12
5. 14

Part 4: Addition on the Number Line

1. 14
2. 16
3. 18
4. 20
5. 19

Part 5: Subtraction by Crossing Out

1. 11 (15 shapes with 4 crossed out)
2. 12 (18 shapes with 6 crossed out)
3. 7 (12 shapes with 5 crossed out)
4. 11 (19 shapes with 8 crossed out)
5. 5 (14 shapes with 9 crossed out)

Part 6: Comparing Numbers

1. 5
2. 8
3. 9

Part 7: Tens and Ones

1. Bubble: ( 4 ); Blanks: 1 ten and 4 ones.
2. Bubble: ( 8 ); Blanks: 1 ten and 8 ones.
3. Bubble: ( 2 ); Blanks: 1 ten and 2 ones.
4. Bubble: ( 9 ); Blanks: 1 ten and 9 ones.