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Cogito

Grade 1 Math · Chapter 5 · Lesson 1

Practice Worksheet

Adding Three Numbers

Look for two that make ten first.

10 problems · about 12 minutes · 1.OA.A.2, 1.OA.B.3

NameDate

Figure — use these to answer the problems

Build 7 and 3 to fill the first ten, then add the rest.

How many14

Counters14
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “Counting to Twenty and Back”

    What comes after 18?

    Answer

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

    One more than 11?

    Answer

  3. From “Breaking Teen Numbers Apart”

    12 is 10 and what?

    Answer

  4. From “Writing Teen Numbers”

    In 16, how many ones are there?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 3 + 7 + 5 = ?

    Answer

  2. 2 + 6 + 8 = ?

    Answer

  3. 8 + 2 + 3 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 5 + 5 + 6 = ?

    Answer

Stretch Yourself

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

2 problems

  1. 9 + 4 + 1 = ?

    Answer

  2. Three Baskets

    One basket has 6 eggs, one has 4, one has 5. How many eggs in all?

    Answereggs