1st Grade Adding and Subtracting Tens Within 100 Worksheet (PDF)

1st Grade math worksheet: Adding and Subtracting Tens Within 100 – Maths PDF

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This adding tens worksheet for 1st Grade covers adding and subtracting tens within 100 (Common Core 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6), with a free PDF to print.

This worksheet has 20 problems about adding ones and tens to two-digit numbers, finding 10 more and 10 less, and subtracting tens (1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6). Use blocks and charts to help. The last six problems are word problems.

Grade 1 · Common Core State Standards: 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6

Adding tens worksheet: exercises 1 to 10

Exercise 1 – Count the blocks

Look at the blocks. Write the number.

Tens rods and ones cubes.

Exercise 2 – 10 more

Write the number that is 10 more:

10 more than 20
10 more than 36
10 more than 58
10 more than 81

Exercise 3 – 10 less

Write the number that is 10 less:

10 less than 40
10 less than 52
10 less than 67
10 less than 90

Exercise 4 – Hundred chart

Use the chart. What is 10 more than 63? What is 10 less than 63?

The yellow box is 63.

Exercise 5 – Add the ones

Find each sum:

\(30 + 4\)
\(50 + 7\)
\(23 + 4\)
\(56 + 3\)

Exercise 6 – Blocks and more ones

The blocks show 35. Add 4 more ones. Find \(35 + 4\).

35 + 4.

Exercise 7 – Add tens

Find each sum:

\(20 + 30\)
\(40 + 40\)
\(30 + 60\)
\(50 + 20\)

Exercise 8 – Tens to a two-digit number

Find each sum:

\(34 + 20\)
\(41 + 30\)
\(26 + 50\)

Exercise 9 – Subtract tens

Find each difference:

\(70 – 20\)
\(90 – 40\)
\(60 – 60\)
\(50 – 10\)

Exercise 10 – Cross out the rods

The blocks show 70. Cross out 4 rods. Find \(70 – 40\).

7 tens.

Exercises 11 and up

Exercise 11 – Make the next ten

Use the number line to find \(28 + 5\).

First hop: 28 to 30. Then add the rest of 5.

Exercise 12 – Make a ten

Find each sum. Make the next ten first.

\(47 + 6\)
\(35 + 8\)
\(59 + 4\)

Exercise 13 – Missing number

Find ?:

\(40 + ? = 70\)
\(? + 20 = 90\)
\(80 – ? = 30\)
\(60 – ? = 20\)

Exercise 14 – Add in any order

Find each sum:

\(3 + 64\)
\(70 + 15\)
\(20 + 58\)

Exercise 15 – Cookie tray

Sofia baked 46 cookies. Then she baked 7 more cookies. How many cookies did she bake in all?

Exercise 16 – Marbles

Ethan had 60 marbles. He gave 20 marbles to his cousin. How many marbles does Ethan have now?

Exercise 17 – Cans for the food drive

Priya’s class collected 52 cans on Monday and 30 cans on Tuesday. How many cans did they collect in all?

Exercise 18 – Sticker book

Liam has a sticker book with 90 stickers. He used 40 stickers. How many stickers are left?

Exercise 19 – Bags of oranges

Each bag at the farmers market has 10 oranges. Aisha buys 6 bags. Then she buys 2 more bags. How many oranges does she have?

Exercise 20 – Mystery number

Noah is thinking of a number. 10 more than his number is 74. What is Noah’s number? What is 10 less than his number?

Key facts behind this adding tens worksheet

Key facts

A two-digit number has tens and ones, like 34 = 3 tens and 4 ones.
To add ones, keep the tens and add the ones.
If the ones pass 9, make the next ten first.
10 more or 10 less changes only the tens digit.
To subtract tens, think of tens: 8 tens – 3 tens = 5 tens.

How to use this adding tens worksheet

Work through the exercises in order: they go from simple to challenging. Write every step on paper, then compare with the solutions page and redo any exercise you missed the next day.

Download the adding tens worksheet as a PDF with the button below and keep it with your notes.

All Grade 1 chapters: Grade 1 math.

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