Addition and Subtraction of the Numbers from 1 to 100

Game: Hundred Chart Hop

Help the frog solve the problem. It starts on the first number. +10 and −10 move it one row down or up, +1 and −1 one square right or left; you can also tap a square or use the arrow keys. When the frog sits on the answer, press Check.

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100

Fill in the correct answer! Type the answer in the box and press Enter or click outside the box to check it. In the >, <, = problems, pick the sign from the list.

On this page: Up to 100 · Compare · Harder problems · Word problems · Test

Adding and subtracting the numbers up to 100

Tens and ones. Add the tens to the tens and the ones to the ones. In 24 + 35: 2 tens + 3 tens = 5 tens and 4 ones + 5 ones = 9 ones, so 24 + 35 = 59.

Subtract the same way. In 68 − 25: 6 tens − 2 tens = 4 tens and 8 ones − 5 ones = 3 ones, so 68 − 25 = 43.

With three numbers, work from left to right: 60 − 20 = 40, then 40 + 7 = 47, so 60 − 20 + 7 = 47.

40 + 50 =

60 − 40 =

90 − 70 + 5 =

30 + 30 + 8 =

8 + 4 − 5 =

3 + 3 + 5 =

20 + 37 =

60 + 38 =

86 − 5 =

78 − 8 =

84 − 2 =

Insert the proper symbol >, < or =

Compare the tens first: 63 > 58, because 6 tens are more than 5 tens. If the tens are the same, compare the ones: 45 > 44.

If there is a sum or a difference, work it out first. For 45 41 + 3, find 41 + 3 = 44, so 45 > 41 + 3.

Lengths: 1 m = 100 cm. Write both lengths in centimeters, then compare: 1 m = 100 cm, so 1 m > 80 cm.

52 56 − 2

34 + 2 36

90 − 6 82

56 − 4 56

75 − 5 75

32 + 6 38

80 − 4 55

72 + 2 80

1 m 60 cm

30 cm 1 m

2 m 100 cm

1 m 99 cm

Harder Problems

Making a ten. When the ones add up to 10 or more, make a ten first. In 47 + 8, split 8 into 3 and 5: 47 + 3 = 50, then 50 + 5 = 55.

For two two-digit numbers, add the tens and the ones separately: in 36 + 27, 30 + 20 = 50 and 6 + 7 = 13, so 36 + 27 = 50 + 13 = 63.

Subtracting across a ten. Take away the tens first, then the ones, and stop at the round ten on the way. In 42 − 17: 42 − 10 = 32; split 7 into 2 and 5: 32 − 2 = 30, then 30 − 5 = 25.

67 + 32 =

80 − 12 =

78 − 10 =

32 + 48 =

77 + 9 =

86 − 8 =

99 − 22 =

88 − 59 =

67 − 29 =

31 − 14 =

92 − 68 =

Word Problems

Mike went to the store and bought some candy for 80 cents. He gave the cashier 1 dollar. How many cents should he get back?

Answer: cents

Solution

1 dollar = 100 cents. 100 − 80 = 20, so Mike should get 20 cents back.

There were 26 children in a class. 7 of them were sick and stayed home. How many children were in the classroom?

Answer: children

Solution

26 − 7 = 19, so there were 19 children in the classroom.

45 children were playing in the schoolyard. 12 were playing soccer, 18 were running, and the rest were playing dodgeball. How many children were playing dodgeball?

Answer: children

Solution

12 + 18 = 30 children were playing soccer or running. 45 − 30 = 15, so 15 children were playing dodgeball.

David wanted to buy a pack of chewing gum and an ice cream. The chewing gum cost 15 cents and the ice cream cost 58 cents. What is the least number of cents David needs to buy both?

Answer: cents

Solution

10 + 50 = 60 and 5 + 8 = 13, so 15 + 58 = 60 + 13 = 73. David needs at least 73 cents.

Test – Addition and Subtraction up to 100

Level:

Level 1: each problem is written vertically, one number under the other. Level 2: in a row, and some have a missing number, such as 36 + ? = 80.

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Addition and Subtraction of the Numbers from 1 to 100

Game: Hundred Chart Hop

Adding and subtracting the numbers up to 100

Insert the proper symbol >, < or =

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Word Problems

Test – Addition and Subtraction up to 100

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