Adding and Subtracting Within 100: math practice, Grade 1 – download the PDF

1 How many tens and ones? ★★★

Look at the picture of tens and ones.

a. How many tens are there? How many ones?

b. What number is shown?

2 Adding a few ones ★★★

Add. Think of the tens and the ones.

1. \(41 + 3\)
2. \(52 + 6\)
3. \(63 + 5\)
4. \(70 + 9\)

3 Adding tens ★★★

Add the tens.

1. \(20 + 30\)
2. \(40 + 40\)
3. \(50 + 20\)
4. \(10 + 60\)

4 Taking away tens ★★★

Subtract. Think of the numbers as tens.

1. \(90 - 30\)
2. \(70 - 20\)
3. \(60 - 20\)
4. \(80 - 70\)

5 Sticker collection ★★★

Maya has 24 stickers in her album. Her cousin gives her 5 more stickers. How many stickers does Maya have now?

6 Hop on the number line ★★★

Start at 35 and hop forward 4 ones. Where do you land?

Write the addition sentence.

7 Ten more, ten less ★★★

Write the number.

1. 10 more than 46
2. 10 less than 73
3. 10 more than 58
4. 10 less than 90

8 Make a ten ★★★

Add to reach the next ten. Then solve the last problem.

1. \(38 + 2 = \square\)
2. \(57 + 3 = \square\)
3. \(64 + 6 = \square\)
4. Now use a ten to solve \(38 + 5\).

9 Regroup the ones ★★★

Add. Write how many ones you get before you regroup.

1. \(29 + 4\)
2. \(47 + 6\)
3. \(58 + 7\)
4. \(36 + 9\)

10 Add a multiple of ten ★★★

Complete each sentence.

1. \(34 + 20 = \square\)
2. \(61 + 30 = \square\)
3. \(18 + 40 = \square\)
4. \(25 + 50 = \square\)

11 Library cart ★★★

A library cart holds 48 books. A helper puts 6 more books on the cart. How many books are on the cart now? Show your thinking with a drawing or a number sentence.

12 Find the mistake ★★★

Leo says that \(36 + 7 = 313\). Is he right? Explain what went wrong and give the correct answer.

13 True or false? ★★★

Say if each sentence is true or false. If it is false, fix it.

1. \(40 + 30 = 70\)
2. \(25 + 4 = 30\)
3. \(80 - 50 = 30\)
4. \(60 - 20 = 50\)

14 Hop back ★★★

Start at 90 and hop back three tens. Where do you land?

Write the subtraction sentence.

15 Two steps ★★★

Solve \(28 + 30 + 4\). Explain which part you added first and why.

16 Missing number ★★★

Find the missing number.

1. \(34 + \square = 39\)
2. \(52 + \square = 82\)
3. \(47 + \square = 50\)
4. \(65 + \square = 95\)

17 Mystery number ★★★

I have 5 tens and some ones. When I add 6 ones, I get 61. How many ones did I start with? What is my number?

18 Explain your strategy ★★★

Solve \(46 + 8\). Then explain your strategy in one or two sentences, using the words tens, ones, and ten.

19 Farm stand ★★★

A farm stand has 40 apples and 30 pears. By noon, 20 pieces of fruit are sold. How many pieces of fruit are left?

20 Add 6 machine ★★★

A number machine adds 6 to each number. Fill in the outputs.

What do you notice when the ones add up to 10 or more?

21 Compare the sums ★★★

Write <, >, or = in each circle.

1. \(45 + 3\) ○ \(50\)
2. \(60 - 20\) ○ \(30 + 10\)
3. \(27 + 30\) ○ \(50 + 9\)
4. \(80 - 30\) ○ \(20 + 40\)