Place Value: Tens and Ones — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each number into the correct category.
1 Ten (10-19)
141811 2 Tens (20-29)
272325 Numbers from 10 to 19 have 1 ten. Numbers from 20 to 29 have 2 tens. Look at the tens digit to decide which group each number belongs in.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. The number 36 has 3 tens.
In the number 36, the digit 3 is in the tens place, so there are 3 tens.
2. 52 = 50 + 2.
In expanded form, 52 is broken into 50 (5 tens) and 2 (2 ones). So 52 = 50 + 2.
3. The ones digit in 74 is 4.
The ones digit is the last digit in a number. In 74, the ones digit is 4.
4. 8 tens and 1 one = 81.
8 tens equal 80 and 1 one equals 1. Adding them gives 80 + 1 = 81.
5. 29 = 2 tens and 9 ones.
In 29, the digit 2 is in the tens place, so there are 2 tens. The 9 is in the ones place.
Part C: True or False?
Read each statement. Circle True or False.
1. The number 43 has 4 tens and 3 ones.
True False
In 43, the digit 4 is in the tens place (4 tens = 40) and the digit 3 is in the ones place (3 ones). So 43 = 40 + 3.
2. The digit 6 in 65 stands for 6.
True False
The digit 6 in 65 is in the tens place, so it stands for 60, not 6.
3. 70 + 8 = 78.
True False
70 is 7 tens and 8 is 8 ones. When you add them, you get 78.
4. The number 90 has 0 tens and 9 ones.
True False
The number 90 has 9 tens and 0 ones. The digit 9 is in the tens place, not the ones place.