1st Grade Adding and Subtracting Tens Within 100 Worksheets with Answers (Free PDF)

1st grade adding tens worksheet – Maths PDF

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This 1st grade adding tens worksheet 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.

Key takeaway: This worksheet helps Grade 1 students practice adding and subtracting tens and ones within 100.

Topic: Adding and Subtracting Tens Within 100 (1st grade)
Content: 20 worksheet problems, from easy to challenging
Standards: 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6
Answers: On a separate page, so you can try every worksheet problem first
Format: Free printable PDF, US Letter, black and white

This worksheet helps Grade 1 students practice adding and subtracting tens and ones within 100. First, children use blocks, a hundred chart, and a number line. Then they apply the same ideas to short stories.

The 20 problems start with counting blocks and finding 10 more and 10 less. Next, they add ones and tens, subtract tens, and make the next ten. Finally, they solve missing number puzzles and story problems about cookies, marbles, cans, stickers, and oranges. Plan about 25 minutes, or split the page over two days.

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

1st grade adding tens worksheet: worksheet problems 1 to 10

1 – Count the blocks

First, look at the blocks. Write the number.

Tens rods and ones cubes.

2 – 10 more

Next, write the number that is 10 more:

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

3 – 10 less

Then, write the number that is 10 less:

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

4 – Hundred chart

Now, use the chart. What is 10 more than 63? What is 10 less than 63?

The yellow box is 63.

5 – Add the ones

Also, find each sum:

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

6 – Blocks and more ones

First, the blocks show 35. Add 4 more ones. Find \(35 + 4\).

35 + 4.

7 – Add tens

Next, find each sum:

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

8 – Tens to a two-digit number

Then, find each sum:

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

9 – Subtract tens

Now, find each difference:

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

10 – Cross out the rods

Also, the blocks show 70. Cross out 4 rods. Find \(70 – 40\).

7 tens.

Worksheet problems 11 and up

11 – Make the next ten

First, use the number line to find \(28 + 5\).

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

12 – Make a ten

Next, find each sum. Make the next ten first.

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

13 – Missing number

Then, find ?:

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

14 – Add in any order

Now, find each sum:

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

15 – Cookie tray

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

16 – Marbles

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

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?

18 – Sticker book

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

19 – Bags of oranges

Now, 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?

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 1st grade adding tens worksheet

Key facts

A two-digit number has tens and ones, like 34 = 3 tens and 4 ones.
Next, 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.
Then, to subtract tens, think of tens: 8 tens – 3 tens = 5 tens.

Common mistakes with this 1st grade adding tens worksheet

When finding 10 more, some children change the ones digit. For example, 10 more than 25 is not 26. Only the tens digit goes up, so look at the tens place first.
Children often add the digits across, so 41 + 5 turns into 96. Instead, keep the tens the same and add only the ones. Then, say 4 tens and 6 ones before writing.
In missing number problems, some children add when they should subtract. For example, in 90 – ? = 50, ask what was taken away. Circle the sign first, then decide.

Tips before you start the worksheet problems

First, do the block problems aloud with a grown-up. Next, say how many tens and ones before you write the number. Then fewer digits will get reversed.
Draw quick rods and dots beside any problem that feels hard. Also, a simple sketch is faster than guessing and shows what each digit means.
Also, teachers can turn the story problems into a center. Ask children to say the number sentence out loud before they solve it, so the plan comes first.

Download the 1st grade adding tens worksheet as a PDF with the button below and keep it with your notes.

1st grade adding tens worksheet: frequently asked questions

How long should a first grader spend on this worksheet?

About 20 to 25 minutes is enough for 20 problems. Younger or slower students can finish half today and half tomorrow. Short, calm practice works better than one long sitting. Also, stopping when focus drops keeps math a good experience.

Should my child use blocks while solving?

Yes, especially for the first problems. Base-ten blocks show tens as rods and ones as cubes. Then, once answers come quickly without blocks, the child can put them away and draw quick sketches instead.

What if my child keeps reversing digits when writing numbers?

First, have the child say the tens and ones out loud, such as 5 tens and 2 ones. Then write the tens digit first. Using a place value mat with two boxes helps, because each digit has its own spot.

All Grade 1 chapters: Grade 1 math.

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