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Cogito

Grade 1 Math · Chapter 5 · Lesson 9

Practice Worksheet

True or False to Twenty

Now both sides can have sums in them.

10 problems · about 13 minutes · 1.OA.D.7

NameDate

Figure — use these to answer the problems

Work out this side, then compare it with another sum.
Start12
Take away7
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

5 problems

  1. From “Missing Numbers to Twenty”

    8 + ? = 12

    Answer

  2. From “Take From Ten in Stories”

    11 − 8 = ?

    Answer

  3. From “Taking From Ten”

    13 − 9 = ?

    Answer

  4. From “Counting On or Making Ten?”

    8 + 2 = ?

    Answer

  5. From “Start With the Bigger One”

    6 + 9 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. Is 13 − 9 = 2 + 2 true?

    • True. Both are 4.
    • False.

  2. Is 8 + 7 = 16 true?

    • True.
    • False. 8 + 7 is 15.

  3. Is 11 − 8 = 1 + 2 true?

    • True. Both are 3.
    • False.

Build It Up

The same ideas with more to keep track of.

1 problem

  1. Is 9 + 4 = 12 true?

    • True.
    • False. 9 + 4 is 13.

Stretch Yourself

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

1 problem

  1. Checking Both Sides

    Is this true? 10 + 5 = 9 + 6

    • True. Both sides are 15.
    • False.