Question

circle the letter of the correct answer.

1. 8 + 8 a. 16 b. 8 c. 15 d. ng
2. 6 + 3 a. 3 b. 9 c. 12 d. ng
3. 3 + 4 a. 5 b. 6 c. 7 d. ng
4. 5 + 6 a. 11 b. 12 c. 13 d. ng
5. 9 + 6 a. 12 b. 14 c. 16 d. ng
6. 4 + 8 a. 11 b. 12 c. 13 d. ng
7. 4 + 3+ 5 a. 11 b. 13 c. 12 d. ng
8. 8 + (3 + 5) a. 8 b. 16 c. 17 d. ng
9. 7 - 3 a. 6 b. 8 c. 10 d. ng
10. 15 - 7 a. 6 b. 7 c. 8 d. ng
11. 14 - 6 a. 8 b. 7 c. 6 d. ng
12. 8 - 8 a. 0 b. 4 c. 8 d. ng
13. 7 + n = 12 n = ■ a. 7 b. 19 c. 5 d. ng
14. n + 2 = 8 n = ■ a. 6 b. 8 c. 10 d. ng

score stop

Explanation:

Step1: Calculate 8 + 8

$8+8 = 16$

Step2: Calculate 6 + 3

$6 + 3=9$

Step3: Calculate 3 + 4

$3+4 = 7$

Step4: Calculate 5 + 6

$5+6 = 11$

Step5: Calculate 9+6

$9 + 6=15$ (not in options, but correct sum is 15, we assume there is an error in options and we go by correct arithmetic)

Step6: Calculate 4+8

$4 + 8=12$

Step7: Calculate 4 + 3+5

$4+3 + 5=(4 + 3)+5=7 + 5=12$

Step8: Calculate 8+(3 + 5)

First, calculate inside the parentheses: $3 + 5 = 8$, then $8+8 = 16$

Step9: Calculate 7 - 3

$7-3 = 4$ (not in options, correct result is 4)

Step10: Calculate 15 - 7

$15-7 = 8$

Step11: Calculate 14 - 6

$14-6 = 8$

Step12: Calculate 8 - 8

$8-8 = 0$

Step13: Solve for n in 7 + n=12

Subtract 7 from both sides: $n=12 - 7=5$

Step14: Solve for n in n + 2=8

Subtract 2 from both sides: $n=8 - 2=6$

Answer:

1. a. 16
2. b. 9
3. c. 7
4. a. 11
5. (no correct option as sum is 15)
6. b. 12
7. c. 12
8. b. 16
9. (no correct option as result is 4)
10. c. 8
11. a. 8
12. a. 0
13. c. 5
14. a. 6