Place Value: Tens and Ones — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which number has the same digit in the tens and ones place?
A) 34
B) 77
C) 58
D) 90
Numbers with matching digits in both places are called doubles. In 77, both the tens and ones digits are 7, making it the only doubles number here.
2. What is 10 less than 85?
A) 84
B) 86
C) 75
D) 95
Taking away 10 from 85 means the tens digit drops from 8 down to 7 while the 5 ones stay put, giving 75.
3. Which number is the greatest: 49, 94, 39, or 93?
A) 49
B) 94
C) 39
D) 93
Compare the tens digits first: 94 and 93 both have 9 tens, so check the ones digits. The 4 ones in 94 beat the 3 ones in 93, making 94 the biggest.
4. A number has 3 more tens than ones. The ones digit is 2. What is the number?
A) 23
B) 32
C) 52
D) 35
If the ones digit is 2 and the tens digit is 3 more than that, the tens digit must be 5. A 5 in the tens place and a 2 in the ones place makes 52.
Part B: Fill in the Blank
Write the correct answer on each line.
1. The number just before 30 is 29.
Counting backward from 30 gives 29, because 29 is one less than 30 on the number line.
2. If you add 1 ten to 43, you get 53.
Adding 1 ten means adding 10. The tens digit grows from 4 to 5 while the 3 ones stay the same, giving 53.
3. The number with the same tens and ones digit using 6 is 66.
Put 6 in the tens place and 6 in the ones place so both digits match. That builds the doubles number 66.
4. 98 is 10 more than 88.
Adding 10 to 88 increases the tens digit from 8 to 9 while the 8 ones stay put, making 98.
5. The smallest two-digit number with 7 in the ones place is 17.
To make the smallest two-digit number, use the smallest possible tens digit, which is 1. Placing a 1 in tens and a 7 in ones gives 17.