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Cogito

Grade 2 Math · Chapter 1 · Lesson 7

Practice Worksheet

Choosing a Strategy

Look at the numbers before you start.

10 problems · about 13 minutes · 2.OA.B.2

NameDate

Figure — use these to answer the problems

Try each pair two ways, then decide which felt faster.
First ten
The rest
First number8
Second number7
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Find the Missing Number”

    ? + 8 = 15

    Answer

  2. From “Addition and Subtraction Together”

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

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 9 + 7 = ?

    Answer

  2. Which strategy fits 6 + 7 best?

    • Near doubles.
    • Take from ten.
    • Count on one at a time.

  3. Which strategy fits 9 + 5 best?

    • Make ten.
    • Doubles.
    • Count on one at a time.

  4. Which strategy fits 7 + 7 best?

    • Doubles.
    • Make ten.
    • Count on one at a time.

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 8 + 6 = ?

    Answer

  2. 13 − 8 = ?

    Answer

Stretch Yourself

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

2 problems

  1. The Shop

    A pen costs 9 pence and a rubber costs 7. What do they cost together?

    Answerpence

  2. The Garden

    Ana planted 6 seeds and Leo planted 7. How many seeds did they plant?

    Answerseeds