Add & Subtract Within 1000 — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each difference by whether the answer is exactly 300 or exactly 500.
Equals 300
500 - 200700 - 400600 - 300 Equals 500
900 - 400800 - 300700 - 200 Sorting differences shows that 5-2, 7-4, and 6-3 hundreds all equal 300.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 700 - 200 = 500
7 - 2 = 5, so 700 - 200 equals 5 hundreds or 500.
2. 900 - 400 = 500
9 - 4 = 5, so 900 - 400 equals 500.
3. 600 - 300 = 300
6 - 3 = 3, so 600 - 300 equals 300.
4. 800 - 500 = 300
8 - 5 = 3, so the difference is 300.
5. 500 - 100 = 400
5 - 1 = 4, so 500 - 100 equals 400.
Part C: True or False?
Read each statement. Circle True or False.
1. 800 - 300 equals 500.
True False
8 - 3 = 5, so 800 - 300 equals 500.
2. 900 - 200 equals 600.
True False
9 - 2 = 7, so the correct answer is 700, not 600.
3. 600 - 400 equals 200.
True False
6 - 4 = 2, so 600 - 400 equals 200.
4. 700 - 500 equals 300.
True False
7 - 5 = 2, so 700 - 500 equals 200, not 300.