Equal Sign & True/False Equations — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 5 + 2 = 8 is false; the real sum is 7 .
5 + 2 equals 7, so the written sum 8 is wrong.
2. 4 + 3 = 6 is false; the real sum is 7 .
4 + 3 equals 7, so 6 is a mistake.
3. 9 = 5 + 3 is false; the right side really equals 8 .
5 + 3 is 8, not 9, so the equation is false.
4. 6 + 4 = 9 is false; the real sum is 10 .
6 + 4 equals 10, so 9 is incorrect.
5. 7 = 4 + 2 is false; the right side really equals 6 .
4 + 2 is 6, not 7, so the equation is false.
6. 3 + 5 = 9 is false; the real sum is 8 .
3 + 5 equals 8, so 9 does not match.
7. 8 + 2 = 11 is false; the real sum is 10 .
8 + 2 is 10, so 11 is the wrong sum.
8. 5 = 1 + 3 is false; the right side really equals 4 .
1 + 3 is 4, not 5, so the equation is false.
9. 7 + 2 = 10 is false; the real sum is 9 .
7 + 2 equals 9, so 10 is too many.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
5 + 2 = 7
→ true
true
4 + 3 = 9
→ false (real sum 7)
false (real sum 7)
6 + 2 = 8
→ true (sum 8)
false (real sum 8)
3 + 5 = 10
→ false (real sum 8)
true (sum 8)
Careful adding shows which equations are right and which hide an error.