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Cogito

Grade 1 Math · Chapter 4 · Lesson 5

Practice Worksheet

Breaking Teen Numbers Apart

Split a teen number into ten and the rest.

10 problems · about 11 minutes · 1.NBT.B.2.b, 1.OA.C.6

NameDate

Figure — use these to answer the problems

Change the ones part. The ten part stays put.
  • 10 + 6 = 16
  • 6 + 10 = 16
  • 16 − 10 = 6
  • 16 − 6 = 10
Ten part10
Ones part6
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

5 problems

  1. From “Writing Teen Numbers”

    In 16, how many ones are there?

    Answer

  2. From “Saying It the Ten Way”

    Ten five is which number?

    Answer

  3. From “Ten and Some More”

    10 + 2 = ?

    Answer

  4. From “Ten Ones Make One Ten”

    How many ones are in one ten?

    Answer

  5. From “Adding and Subtracting to Ten”

    7 − 2 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 12 is 10 and what?

    Answer

  2. 16 is 10 and what?

    Answer

  3. 14 is 10 and what?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 19 is 10 and what?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

1 problem

  1. Splitting Sweets

    Mia has 17 sweets. She puts 10 in a bag. How many are left out?

    Answersweets