1st Grade Adding and Subtracting Tens Within 100 Test with Answer Key (Free PDF)

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This 1st grade adding tens test 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 test helps Grade 1 teachers and parents check whether students can add and subtract tens and ones within 100.

Topic: Adding and Subtracting Tens Within 100 (1st grade)
Content: 8 questions with point values, about 45 minutes
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 test helps Grade 1 teachers and parents check whether students can add and subtract tens and ones within 100. It covers the standards on two-digit addition, 10 more and 10 less, and subtracting multiples of ten.

The test has 8 questions worth 20 points in total, and most parts are worth 1 point. Children read blocks, find mystery numbers, add, subtract tens, use a number line and a hundred chart, and solve one story. Allow 30 minutes. Read each question aloud for children who need it.

This test has 8 questions and is worth 20 points. Read each question carefully and write your answers in the space. You have about 30 minutes. Use the pictures to help you.

Time and points

About this test

Grade: Grade 1
Chapter: Adding and Subtracting Tens Within 100
Standards: 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6
Time: 30 minutes
Total: 20 points

1st grade adding tens test: questions

1 – Tens and ones [2 pts]

First, look at the blocks.

Write the number. (1 point)
Write the number that is 10 more. (1 point)

2 – Mystery numbers [2 pts]

10 more than a number is 83. What is the number? (1 point)
What is 10 less than 61? (1 point)

3 – Add [3 pts]

Then, find each sum.

\(62 + 5\) (1 point)
\(45 + 30\) (1 point)
\(38 + 6\) (1 point)

4 – Subtract tens [3 pts]

Now, the blocks show 90. Four rods and one more are crossed out.

Find \(90 – 50\). (1 point)
Also, find \(70 – 20\). (1 point)
Find \(80 – 80\). (1 point)

5 rods are crossed out.

5 – Number line [2 pts]

Also, use the number line to find \(47 + 5\).

Where does the first hop end? (1 point)
What is the sum? (1 point)

First hop: +3.

6 – Missing number [3 pts]

First, find the missing number.

\(50 + ? = 80\) (1 point)
\(? + 40 = 90\) (1 point)
\(70 – ? = 20\) (1 point)

7 – Tickets at the fair [3 pts]

Maya sold 24 tickets on Saturday and 30 tickets on Sunday.

Write an equation for the total. (1 point)
How many tickets did she sell in all? (1 point)
On Monday she sold 10 more tickets than on Sunday. How many tickets did she sell on Monday? (1 point)

Question 8 and after

8 – Hundred chart [2 pts]

Then, use the chart. The yellow box is 58.

What is 10 less than 58? (1 point)
What is 10 more than 58? (1 point)

The shaded box is 58.

Key facts behind this 1st grade adding tens test

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 test

Students rush two-step addition and stop after the first hop. For example, with 27 + 6 they reach 30 and forget the rest. Remind them to add the leftover part too.
On the hundred chart, children move the wrong way for 10 less. Also, tell them up is less and down is more. Then check that the new number is smaller.
In missing number questions, children pick the wrong operation. Circle the sign first, because a minus sign means take away. Then decide what the question mark stands for.

Test-taking strategy

Do the questions you know first. Then return to the harder ones, because two-step questions may take longer.
For the story question, write a number sentence before solving. As a result, you earn the sentence point and also pick the right operation.
Parents should keep the day calm. A short review of 10 more and 10 less the evening before is plenty, and a good night of sleep helps more than cramming.

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

1st grade adding tens test: frequently asked questions

What score shows a first grader understands this topic?

A score of 16 out of 20, or 80 percent, shows solid understanding in most classrooms. Scores between 12 and 15 mean the child knows the main ideas but needs practice on a few skills. Below 12, review with blocks before moving on.

Can students use a hundred chart or blocks during the test?

That is up to the teacher. The test already shows blocks, a number line, and a hundred chart in several questions. However, allowing a chart for the whole test can fit younger students who are still learning.

How should a child check an addition answer on a test?

Use the opposite operation or a second method. For example, after adding 20 to a number, subtract 20 and see if you return to the start. Also, count the tens again. Two checks catch most mistakes.

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