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Cogito

Grade 2 Math · Chapter 1 · Lesson 5

Practice Worksheet

Addition and Subtraction Together

One fact family, four number sentences.

10 problems · about 12 minutes · 2.OA.B.2, 2.OA.A.1

NameDate

Figure — use these to answer the problems

Set the two parts, then reveal the four sentences they make.
  • 8 + 7 = 15
One part8
The other part7
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Take From Ten to Subtract”

    15 − 8 = ?

    Answer

  2. From “Make Ten to Add”

    9 + 8 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

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

    Answer

  2. How many number sentences come from parts of 6 and 9?

    Answer

  3. You know 7 + 6 = 13. What is 13 − 7?

    Answer

  4. You know 9 + 8 = 17. What is 17 − 8?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. Parts of 5 and 9. What is the whole?

    Answer

  2. Whole 18, one part 9. What is the other part?

    Answer

Stretch Yourself

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

2 problems

  1. The Coat Rack

    14 coats hang on a rack. 6 are red. How many coats are not red?

    Answercoats

  2. Lost Marbles

    Leo had 17 marbles. Now he has 9. How many did he lose?

    Answermarbles