10 printable sets · answer key on every set

Place Value: Tens and Ones Worksheets

CCSS 1.NBT.B.2
20 problems per set
Answer key included

What this skill is

Reading a two-digit number as a count of tens plus a count of ones.

When it comes up: Second half of first grade.

The mistake to watch for

Reading 47 as "four and seven" rather than "forty and seven", which later makes column addition look arbitrary.

How to help

Bundle straws into tens with rubber bands. Forty-seven is four bundles and seven loose — you can see it.

Next: Addition within 100.

A worked example

Take 47. The 4 is in the tens place, so it means 4 tens, or 40. The 7 is in the ones place, so it means 7. 47 = 4 tens and 7 ones.

Words to know

digit: One of the ten number symbols 0 to 9. The number 47 has two digits.
place: Where a digit sits in a number: ones, tens or hundreds.
value: How much a digit is worth because of where it sits. In 47, the 4 is worth 40.
ten: The number 10, one more than nine.
number: A word or symbol that tells how many, like 5 or twelve.

Practice

Break each number into tens and ones.

Showing Set 1 · 20 problems

76 = ___
84 = ___
20 = ___
90 = ___
28 = ___
45 = ___
31 = ___
30 = ___
69 = ___
75 = ___
15 = ___
99 = ___
50 = ___
46 = ___
40 = ___
66 = ___
71 = ___
10 = ___
56 = ___
41 = ___

Download this set20 problems · answer key included PDF

Answer key

7 tens, 6 ones
8 tens, 4 ones
2 tens, 0 ones
9 tens, 0 ones
2 tens, 8 ones
4 tens, 5 ones
3 tens, 1 ones
3 tens, 0 ones
6 tens, 9 ones
7 tens, 5 ones
1 tens, 5 ones
9 tens, 9 ones
5 tens, 0 ones
4 tens, 6 ones
4 tens, 0 ones
6 tens, 6 ones
7 tens, 1 ones
1 tens, 0 ones
5 tens, 6 ones
4 tens, 1 ones

All 10 sets

Each set is a different list of 20 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made

Problems are generated for each set and checked against 1.NBT.B.2 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.