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Cogito

Grade 1 Math · Chapter 5 · Lesson 2

Practice Worksheet

Making Ten From Nine

Move one across and the hard sum turns easy.

10 problems · about 13 minutes · 1.OA.C.6, 1.OA.B.3

NameDate

Figure — use these to answer the problems

Tap the button to move one across, then read the new sum.
First ten
The rest
First number9
Second number6
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “Adding Three Numbers”

    3 + 7 + 5 = ?

    Answer

  2. From “Counting to Twenty and Back”

    What comes after 18?

    Answer

  3. From “One More, One Less to Twenty”

    One more than 11?

    Answer

  4. From “Breaking Teen Numbers Apart”

    12 is 10 and what?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 9 + 5 = ?

    Answer

  2. 9 + 8 = ?

    Answer

  3. 9 + 3 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 9 + 7 = ?

    Answer

Stretch Yourself

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

2 problems

  1. 9 + 9 = ?

    Answer

  2. Marble Jar

    Mia has 9 marbles. She finds 6 more. How many now?

    Answermarbles