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Math Grade K-1 Answer Key

Counting by 2s to 20

Skip count with pairs and even numbers

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Counting by 2s to 20

Skip count with pairs and even numbers

Math - Grade K-1

Instructions: Read each problem carefully. Count by 2s and write your answer on the line.
  1. 1

    Write the numbers when you count by 2s from 2 to 20.

    Start at 2 and add 2 each time.

    The numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20.
  2. 2

    Fill in the missing number: 2, 4, __, 8, 10.

    The missing number is 6 because counting by 2s goes 2, 4, 6, 8, 10.
  3. 3

    Fill in the missing number: 10, 12, __, 16, 18.

    Add 2 to 12.

    The missing number is 14 because 14 comes after 12 when counting by 2s.
  4. 4

    There are 2 shoes in each pair. Count by 2s to find how many shoes are in 5 pairs.

    There are 10 shoes in 5 pairs because 2, 4, 6, 8, 10 counts five pairs.
  5. 5

    Circle the numbers you say when you count by 2s: 1, 2, 3, 4, 5, 6, 7, 8.

    Skip one number each time you count.

    The numbers to circle are 2, 4, 6, and 8 because they are counting by 2s numbers.
  6. 6

    Fill in the missing numbers: 2, __, 6, __, 10.

    The missing numbers are 4 and 8 because the counting pattern is 2, 4, 6, 8, 10.
  7. 7

    A bug has 2 antennae. Count by 2s to find how many antennae 4 bugs have.

    Count one group of 2 for each bug.

    Four bugs have 8 antennae because 2, 4, 6, 8 counts four groups of 2.
  8. 8

    What number comes next? 6, 8, 10, __.

    The next number is 12 because 10 plus 2 is 12.
  9. 9

    What number comes before 18 when you count by 2s?

    Think of the number that is 2 less than 18.

    The number before 18 is 16 because counting by 2s goes 14, 16, 18.
  10. 10

    Count the dots by 2s. There are 6 pairs of dots. How many dots are there in all?

    There are 12 dots in all because 2, 4, 6, 8, 10, 12 counts six pairs.
  11. 11

    Fill in the missing number: 12, 14, 16, __, 20.

    Add 2 to 16.

    The missing number is 18 because counting by 2s goes 12, 14, 16, 18, 20.
  12. 12

    Is 15 a number you say when counting by 2s from 2 to 20? Write yes or no and explain.

    No, 15 is not a number you say when counting by 2s from 2 to 20 because the counting numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20.
  13. 13

    There are 2 socks in each pair. How many socks are in 7 pairs?

    Count 7 groups of 2.

    There are 14 socks in 7 pairs because counting by 2s seven times gives 2, 4, 6, 8, 10, 12, 14.
  14. 14

    Write the next three numbers: 14, 16, __, __, __.

    Keep adding 2.

    The next three numbers are 18, 20, and 22 because each number is 2 more than the number before it.
  15. 15

    A number line shows 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20. If you hop by 2s from 0 to 20, how many hops do you make?

    You make 10 hops because it takes ten jumps of 2 to go from 0 to 20.
LivePhysics™.com Math - Grade K-1 - Answer Key