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Cogito

Kindergarten Math · Chapter 4 · Lesson 3

Practice Worksheet

The Missing Part

You know the whole and one part. Find the other.

10 problems · about 9 minutes · K.OA.A.4

NameDate

Figure — use these to answer the problems

Move stars between trays. One tray plus the other always makes the whole.
Tray you can see
Tap one to move it across
Hidden tray
Tap one to move it back
Stars in all7
Tray you can see4
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “Breaking a Number Apart”

    8 is 5 and how many?

    Answer

  2. From “Taking Away”

    8 − 3 = ?

    Answer

  3. From “Adding in Any Order”

    2 + 6 = ?

    Answer

  4. From “Counting On”

    6 + 2 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 6 + ? = 10

    Answer

  2. 5 + ? = 8

    Answer

  3. 2 + ? = 6

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 7 + ? = 7

    Answer

  2. 4 + ? = 9

    Answer

Stretch Yourself

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

1 problem

  1. The Hidden Marbles

    Nine marbles. Six on the table. How many in the bag?

    Answer