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Math Grade K-1 Answer Key

Adding Three Small Numbers

Practice adding 3 numbers with sums up to 20

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Adding Three Small Numbers

Practice adding 3 numbers with sums up to 20

Math - Grade K-1

Instructions: Read each problem carefully. Add all three numbers to find the total. Show your work in the space provided.
  1. 1

    Add: 2 + 3 + 1 = ____

    Start with 2, count on 3 more, then count on 1 more.

    The sum is 6 because 2 + 3 + 1 equals 6.
  2. 2

    Mia has 1 red balloon, 4 blue balloons, and 2 yellow balloons. How many balloons does Mia have in all?

    Mia has 7 balloons in all because 1 + 4 + 2 equals 7.
  3. 3

    Add: 5 + 2 + 2 = ____

    You can add 2 + 2 first, then add 5.

    The sum is 9 because 5 + 2 + 2 equals 9.
  4. 4

    There are 3 birds in a tree, 2 birds on a fence, and 4 birds on the grass. How many birds are there altogether?

    There are 9 birds altogether because 3 + 2 + 4 equals 9.
  5. 5

    Add: 0 + 6 + 3 = ____

    Adding 0 does not change the number.

    The sum is 9 because 0 + 6 + 3 equals 9.
  6. 6

    Sam puts 2 crayons, 2 pencils, and 3 markers in a box. How many writing tools are in the box?

    There are 7 writing tools in the box because 2 + 2 + 3 equals 7.
  7. 7

    Add: 4 + 1 + 4 = ____

    Try adding 4 + 4 first, then add 1.

    The sum is 9 because 4 + 1 + 4 equals 9.
  8. 8

    A plate has 3 apple slices, 3 orange slices, and 1 banana slice. How many fruit slices are on the plate?

    There are 7 fruit slices on the plate because 3 + 3 + 1 equals 7.
  9. 9

    Add: 6 + 1 + 2 = ____

    Start at 6 and count on 1, then count on 2 more.

    The sum is 9 because 6 + 1 + 2 equals 9.
  10. 10

    Lena sees 4 ladybugs on a leaf, 2 ladybugs on a rock, and 3 ladybugs on a flower. How many ladybugs does she see?

    Lena sees 9 ladybugs because 4 + 2 + 3 equals 9.
  11. 11

    Add: 3 + 5 + 2 = ____

    Look for numbers that make 5, such as 3 + 2.

    The sum is 10 because 3 + 5 + 2 equals 10.
  12. 12

    There are 5 cubes in one pile, 5 cubes in another pile, and 1 cube by itself. How many cubes are there in all?

    There are 11 cubes in all because 5 + 5 + 1 equals 11.
  13. 13

    Add: 7 + 2 + 1 = ____

    Add 2 + 1 first, then add that to 7.

    The sum is 10 because 7 + 2 + 1 equals 10.
  14. 14

    Nico reads 2 books on Monday, 3 books on Tuesday, and 2 books on Wednesday. How many books does Nico read in all?

    Nico reads 7 books in all because 2 + 3 + 2 equals 7.
  15. 15

    Add: 4 + 4 + 2 = ____

    Add the two 4s first, then add 2.

    The sum is 10 because 4 + 4 + 2 equals 10.
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