Make 100

10Make 100.png
10Make 100.png

Make 100

0.99

2.NBT.6

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About This Sprint

  • Use mental math to write the missing addend that will make 100.

  • Before taking this Sprint, students should be comfortable using one of the following strategies:

    • Make the next ten, then make 100.

      For the problem 38 + ___ = 100:

      38 + 2 = 40

      40 + 60 = 100

      2 + 60 = 62

      38 + 62 = 100.

    • Add tens & then ones.

      For the problem 27 + ___ = 100:

      27 + 70 = 97

      97 + 3 = 100

      70 + 3 = 73

      27 + 73 = 100.

    • Subtract tens & then ones from 100.

      For the problem 19 + ___ = 100:

      100 – 10 = 90

      90 – 9 = 81

      100 – 81 = 19

      19 + 81 = 100

    • Subtract ones & then tens from 100.

      For the problem 74 + ___ = 100:

      100 – 4 = 96

      96 – 70 = 26

      100 – 74 = 26

      74 + 26 = 100