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Cogito

Grade 2 Math · Chapter 1 · Lesson 6

Practice Worksheet

Find the Missing Number

The unknown can sit anywhere in the sentence.

10 problems · about 13 minutes · 2.OA.A.1, 2.OA.B.2

NameDate

Figures — use these to answer the problems

The missing part is worked out from the other two.
First part8
Total15
Figure 1
The same fact, written with the total first.
First part9
Second part6
Figure 2

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Addition and Subtraction Together”

    You know 8 + 5 = 13. What is 13 − 5?

    Answer

  2. From “Take From Ten to Subtract”

    15 − 8 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. ? + 8 = 15

    Answer

  2. What does the equal sign mean?

    • Both sides are worth the same.
    • The answer comes next.

  3. 9 + ? = 16

    Answer

  4. ? + 5 = 13

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 17 − ? = 9

    Answer

  2. 14 = 6 + ?

    Answer

Stretch Yourself

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

2 problems

  1. The Jar

    Ana put 7 more marbles in a jar. Now there are 16. How many were in it before?

    Answermarbles

  2. The Bookshelf

    Leo took 8 books off a shelf. 7 are left. How many books were there at the start?

    Answerbooks