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Cogito

Grade 1 Math · Chapter 5 · Lesson 8

Practice Worksheet

Missing Numbers to Twenty

The box can be anywhere in the sentence.

10 problems · about 13 minutes · 1.OA.D.8

NameDate

Figure — use these to answer the problems

Change the known parts and watch the box work itself out.
Known part9
Whole15
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “Take From Ten in Stories”

    11 − 8 = ?

    Answer

  2. From “Taking From Ten”

    13 − 9 = ?

    Answer

  3. From “Counting On or Making Ten?”

    8 + 2 = ?

    Answer

  4. From “Start With the Bigger One”

    6 + 9 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 8 + ? = 12

    Answer

  2. 13 − ? = 9

    Answer

  3. 9 + ? = 13

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. ? + 6 = 14

    Answer

Stretch Yourself

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

2 problems

  1. 15 − ? = 8

    Answer

  2. Saving Up

    Ben has 8 coins. He needs 13. How many more does he need?

    Answercoins