Place Value: Tens and Ones — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which number name matches the number 76?
A) sixty-seven
B) seventy-six
C) seventeen
D) sixty-six
The 7 in the tens place is read "seventy" and the 6 in the ones place is read "six," so 76 is called seventy-six.
2. If you swap the digits of 53, what number do you get?
A) 53
B) 35
C) 55
D) 33
Swapping moves the 5 from tens to ones and the 3 from ones to tens, so 53 becomes 35.
3. Which number is 10 more than 46?
A) 47
B) 36
C) 56
D) 64
Adding 10 only changes the tens digit by 1. The 4 tens in 46 become 5 tens, making 56.
4. Which expanded form equals 91?
A) 9 + 1
B) 90 + 10
C) 19 + 0
D) 90 + 1
In expanded form, the 9 in the tens place is written as 90 and the 1 in the ones place is written as 1, which sums to 91.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 10 more than 27 is 37.
Adding 10 bumps the tens digit up by 1 and leaves the ones alone, so 2 tens and 7 ones becomes 3 tens and 7 ones, or 37.
2. The number 65 = 60 + 5.
The tens part of 65 is 6 tens, which equals 60. Adding 60 plus the 5 ones puts the number back together.
3. If you swap the digits of 18, you get 81.
Swapping puts the 8 in the tens place and the 1 in the ones place, which makes 81.
4. 10 less than 52 is 42.
Subtracting 10 lowers the tens digit by 1 while the ones digit stays the same. So 5 tens and 2 ones becomes 4 tens and 2 ones, or 42.
5. A number with 6 in the tens place and 0 in the ones place is 60.
Place the 6 in the tens spot on the left and the 0 in the ones spot on the right to spell out 60.