Worksheet: Word Problems: Adding Three Numbers

In this worksheet, we will practice solving problems by adding three numbers with sums up to 20 and writing equations to represent the problem.


A person has 2 white puppies, 2 brown cats, and 7 black puppies. How many puppies do they have?


William has 15 cars colored red, blue, and green.

Which of these could be his car collection?

  • A
  • B
  • C


Find the group with 5 balloons.

  • A
  • B
  • C


In a zoo, there are 6 lions, 3 elephants, and 7 monkeys.

Which addition sentence matches this story?

  • A?+3+7=6
  • B6+3+?=7
  • C6+3+7=?

How many animals are there?


Last weekend, 19 first graders went to a field day. 3 of them did the long jump, 11 ran in a race, and others did the high jump.

Answer the following questions to complete the addition expression.

What number belongs in the first box?

  • A
  • B
  • C

How many students did the high jump?

  • A
  • B
  • C


Olivia has 3 chocolates, 7 lollipops, and 6 fruit candies. In total, she has 3+7+6 pieces of candy.

Find the picture that shows the amount of candy she has.

  • A
  • B
  • C

How many pieces of candy does she have?


On a trip to the aquarium, Natalie saw 17 animals. She saw 8 sharks, 3 whales, and 6 dolphins. Help her write an addition sentence to show how many animals she saw.

What number goes in the red box?

What number goes in the blue box?


Noah bought 3 bananas, 5 apples, and 6 oranges. How many pieces of fruit did he buy?


For a school fair, William made 1 cake, 8 sandwiches, and 5 doughnuts.

What number is missing from the addition expression?

How many things did he make in total?


The pictures show how many of each type of animal are at a farm.

Find an addition sentence that shows the total number of animals.

  • A4+6+5=15
  • B4+6+5=16
  • C4+5+5=15


There are 5 blue flowers, 3 purple flowers, and 6 yellow flowers growing in Rosie’s garden. How many flowers are there?


Find the missing number.


There are 2+6+11 items in Matthew’s pencil case. He has 6 pencils, 11 pens, and some erasers.

How many erasers does he have?

What is the total number of items in his pencil case?


18 students are wearing colored tops for a game.

There are 7 red tops, some green tops, and 5 blue tops.

Find the addition sentence that matches this story.

  • A
  • B
  • C

How many green tops are there?


A bowl has 7 green apples, 6 yellow bananas, and 2 red apples. How many apples are in the bowl?


Madison has 1 dog, 7 fish, and 2 rabbits. She has 1+7+2 pets in total. How many pets does she have?

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