Place Value: Tens and Ones — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. The word name for 42 is forty-two.
The tens digit 4 is spoken as "forty" and the ones digit 2 is spoken as "two," so 42 is read as forty-two.
2. 56 = 50 + 6.
The 5 in the tens place of 56 is worth 50. Adding 50 plus the 6 ones gives us back 56.
3. The value of the digit 8 in 83 is 80.
The 8 in 83 is in the tens place, so its value is 8 groups of ten. Eight tens equal 80.
4. 4 tens and 5 ones = 45.
Four tens equal 40 and 5 ones equal 5. Put the tens digit first and the ones digit second to build 45.
5. The word name for 71 is seventy-one.
The tens digit 7 in 71 is read as "seventy," and the ones digit 1 is read as "one," so 71 becomes seventy-one.
6. The tens digit in 97 is 9.
The tens digit is the leftmost digit in a two-digit number. In 97, the left digit is 9, which represents 90.
7. 23 = 20 + 3.
Two tens plus 3 ones make 23. The 2 goes in the tens place and the 3 goes in the ones place.
8. The number sixty-four written as a number is 64.
"Sixty" means 6 tens, or 60, and "four" means 4 ones. Combining the digits gives the numeral 64.
9. In the number 35, the 5 stands for 5.
The 5 in 35 sits in the ones place, so it represents just 5 single units, not any tens.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
53
→ fifty-three
twenty-eight
28
→ twenty-eight
ninety-four
94
→ ninety-four
seventeen
17
→ seventeen
fifty-three
Read each number by its tens digit name, then add the ones digit name: 53 is fifty-three, 28 is twenty-eight, 94 is ninety-four, and 17 is a teen number read as seventeen.