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Cogito

Grade 1 Math · Chapter 3 · Lesson 5

Practice Worksheet

What Changed?

You know the start and the end. What happened in between?

10 problems · about 12 minutes · 1.OA.A.1, 1.OA.B.4

NameDate

Figure — use these to answer the problems

Change the start or what is left. The missing bit works itself out.
Started with9
Left over4
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

5 problems

  1. From “The Hidden Part”

    Whole 9, one part 4. What is the other part?

    Answer

  2. From “Taking Away”

    7 − 3 = ?

    Answer

  3. From “Counting Up To Subtract”

    9 − 7 = ?

    Answer

  4. From “How Many More To Make It?”

    3 + ? = 7

    Answer

  5. From “Facts to Ten”

    7 + 3 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 9 − ? = 6

    Answer

  2. 7 − ? = 2

    Answer

  3. 8 − ? = 5

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 10 − ? = 6

    Answer

Stretch Yourself

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

1 problem

  1. The Bird Table

    There were 7 birds. Now there are 3. How many flew away?

    Answerbirds