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Cogito

Grade 1 Math · Chapter 8 · Lesson 4

Practice Worksheet

Adding Ones Without Making a New Ten

Add a small number when the ones still fit.

10 problems · about 11 minutes · 1.NBT.C.4

NameDate

Figure — use these to answer the problems

Add a small number. Watch the rods stay the same.
First number
and Add ones
Altogether

Tens

2

Ones

7

23 + 4 = 27

First number23
Add ones4
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “Adding Tens to Any Number”

    16 + 20 = ?

    Answer

  2. From “Subtracting Tens From Tens”

    30 − 20 = ?

    Answer

  3. From “Adding Tens to Tens”

    20 + 10 = ?

    Answer

  4. From “One More, One Less, Ten More, Ten Less”

    Ten less than 34 is?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 31 + 6 = ?

    Answer

  2. Which part changes in 22 + 3?

    • The ones.
    • The tens.

  3. 32 + 5 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 14 + 3 = ?

    Answer

Stretch Yourself

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

2 problems

  1. 25 + 4 = ?

    Answer

  2. More Shells

    Ana has 21 shells. She finds 5 more. How many now?

    Answershells