Practicing with Two-Digit Numbers

1. Fill in.

a. ____________________________

______ + _____

 tens ones

b. ____________________________

______ + _____

 tens ones

c. ____________________________

______ + _____

 tens ones

d. ____________________________

______ + _____

 tens ones

2. Add a ten by drawing another ten-column. Subtract a ten by crossing out a ten-column.

 a.  43 + 10 = ______ b.  28 + 10 = ______ c.  56 − 10 = ______

3. Explain to your teacher how you add a ten to a number, or subtract a ten.

 a.  61 + 10 = ______     61 − 10 = ______ b.  37 + 10 = ______     37 − 10 = ______ c.  89 + 10 = ______     89 − 10 = ______

4. Match the number to its name.

 16 60 23 32 76 14 12 twelve fourteen sixteen thirty-two sixty twenty-three seventy-six
 90 29 11 19 91 39 93 eleven nineteen ninety-three ninety-one twenty-nine thirty-nine ninety

5. Write each number as (tens) + (ones).

 a.  91 = _____ + _____ b.  79 = _____ + _____ c.  58 = _____ + _____

 a.  20 + 6  =  _______     80 + 2  =  _______ b.  60 + 7  =  _______     10 + 1  =  _______ c.  6 + 50 =  _______     5 + 30  =  _______

7. Fill in.

 I'm between 84 and 92. I don't have any ones. Who am I?

This lesson is taken from Maria Miller's book Math Mammoth Place Value 1, and posted at www.HomeschoolMath.net with permission from the author. Copyright © Maria Miller.

Math Mammoth Place Value 1

A self-teaching worktext for 1st grade that covers forming ten-groups, filling the 100-chart, breaking numbers to tens & ones, and comparing.