Two-Digit Addition & Subtraction — 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.
Even Numbers
245268 Odd Numbers
371541 Even numbers end in 0, 2, 4, 6, or 8. Odd numbers end in 1, 3, 5, 7, or 9. Check the ones digit of each number to decide which group it belongs to.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 23 + 14 = 37.
Add the ones: 3 + 4 = 7. Add the tens: 2 + 1 = 3. So 23 + 14 = 37.
2. 45 − 12 = 33.
Subtract the ones: 5 − 2 = 3. Subtract the tens: 4 − 1 = 3. So 45 − 12 = 33.
3. The tens digit in 67 is 6.
In the number 67, the digit 6 is in the tens place and the digit 7 is in the ones place.
4. 36 + 14 = 50.
To find the missing number, subtract: 50 − 36 = 14. Check: 36 + 14 = 50.
5. 58 − 25 = 33.
Subtract the ones: 8 − 5 = 3. Subtract the tens: 5 − 2 = 3. So 58 − 25 = 33.
Part C: True or False?
Read each statement. Circle True or False.
1. 47 + 23 = 70.
True False
Add the ones: 7 + 3 = 10, write 0 and carry 1. Add the tens: 4 + 2 + 1 = 7. So 47 + 23 = 70.
2. 82 − 30 = 52.
True False
Subtract the ones: 2 − 0 = 2. Subtract the tens: 8 − 3 = 5. So 82 − 30 = 52.
3. The number 55 has 5 tens and 0 ones.
True False
The number 55 has 5 tens and 5 ones, not 0 ones. The ones digit is 5.
4. 63 − 27 = 46.
True False
63 − 27 = 36, not 46. You need to regroup: borrow 1 ten to get 13 − 7 = 6 in the ones place, then 5 − 2 = 3 in the tens place.