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.
3 Tens to 4 Tens (30-49)
423149 5 Tens to 7 Tens (50-78)
566378 Check each tens digit: 42, 31, and 49 all have 3 or 4 tens, while 56, 63, and 78 have 5, 6, and 7 tens, placing them in the higher group.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. The number 94 has 4 ones.
The ones digit is the rightmost number. In 94, that digit is 4, so there are 4 ones.
2. 85 = 80 + 5.
The 8 in 85 is in the tens place and is worth 80. Adding 80 plus the 5 ones gives 85.
3. The tens digit in 26 is 2.
The tens digit is always the leftmost digit in a two-digit number. In 26, the digit on the left is 2.
4. 3 tens and 7 ones = 37.
Three tens make 30, and 7 ones add another 7. Together they form the number 37.
5. 18 = 10 + 8.
One ten plus 8 ones equals 18. The 1 goes in the tens place and the 8 goes in the ones place.
Part C: True or False?
Read each statement. Circle True or False.
1. The number 59 has 5 tens and 9 ones.
True False
True — the 5 in the tens place is worth 50 and the 9 in the ones place is worth 9, which adds up to 59.
2. 30 + 6 = 63.
True False
False — 30 plus 6 is 36, not 63. The digits 3 and 6 were swapped in the wrong answer.
3. The digit 7 in 72 stands for 70.
True False
True — the 7 is in the tens place, so it represents 7 groups of ten, which equals 70.
4. The number 40 has 4 ones and 0 tens.
True False
False — 40 actually has 4 tens and 0 ones, because the 4 sits in the tens place and the 0 sits in the ones place.