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Cogito

Grade 1 Math · Chapter 10 · Lesson 8

Practice Worksheet

When You Need a New Ten

Make a new ten with bigger numbers too.

10 problems · about 14 minutes · 1.NBT.C.4

NameDate

Figure — use these to answer the problems

Count the loose ones. If there are ten or more, bundle them.
First number
and Second number
Altogether

Tens

5

Ones

13

38 + 25 = 63

First number38
Second number25
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “Adding to 100 With Place Value”

    34 + 25 = ?

    Answer

  2. From “Ten More, Ten Less to 100”

    Ten more than 66 is?

    Answer

  3. From “Comparing Numbers to 100”

    Which is greater, 38 or 41?

    Answer

  4. From “Counting to 120”

    What comes right after 104?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 29 + 34 = ?

    Answer

  2. What do you check before adding the tens?

    • Whether the ones reach ten.
    • Which number is bigger.

  3. 46 + 27 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 35 + 28 = ?

    Answer

Stretch Yourself

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

2 problems

  1. 42 + 31 = ?

    Answer

  2. Two Piles of Books

    27 books on one shelf and 46 on another. How many?

    Answerbooks