Let's solve each of these addition problems involving positive and negative integers. The key rules to remember:
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Adding two positive numbers: Add their absolute values, result is positive.
-
Adding two negative numbers: Add their absolute values, result is negative.
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Adding a positive and a negative number: Subtract the smaller absolute value from the larger one, and the sign of the result is the same as the number with the larger absolute value.
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Solutions:
1) (+30) + (+43) =
+73
→ 30 + 43 = 73
2) (+31) + (+82) =
+113
→ 31 + 82 = 113
3) (-84) + (+21) =
-63
→ 84 - 21 = 63, and since |-84| > |+21|, result is negative.
4) (+70) + (+57) =
+127
→ 70 + 57 = 127
5) (+68) + (+16) =
+84
→ 68 + 16 = 84
6) (-8) + (+36) =
+28
→ 36 - 8 = 28, and since |+36| > |-8|, result is positive.
7) (+2) + (+16) =
+18
→ 2 + 16 = 18
8) (-84) + (+35) =
-49
→ 84 - 35 = 49, and since |-84| > |+35|, result is negative.
9) (+85) + (+58) =
+143
→ 85 + 58 = 143
10) (+77) + (+46) =
+123
→ 77 + 46 = 123
11) (+71) + (+41) =
+112
→ 71 + 41 = 112
12) (+74) + (+9) =
+83
→ 74 + 9 = 83
13) (+86) + (-91) =
-5
→ 91 - 86 = 5, and since |-91| > |+86|, result is negative.
14) (+35) + (+90) =
+125
→ 35 + 90 = 125
15) (+71) + (-55) =
+16
→ 71 - 55 = 16, and since |+71| > |-55|, result is positive.
16) (+38) + (+57) =
+95
→ 38 + 57 = 95
17) (-37) + (-2) =
-39
→ 37 + 2 = 39, both negative → result is negative.
18) (+3) + (+51) =
+54
→ 3 + 51 = 54
19) (+84) + (+12) =
+96
→ 84 + 12 = 96
20) (+86) + (-31) =
+55
→ 86 - 31 = 55, and since |+86| > |-31|, result is positive.
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✔ Final Answers:
1) +73
2) +113
3) -63
4) +127
5) +84
6) +28
7) +18
8) -49
9) +143
10) +123
11) +112
12) +83
13) -5
14) +125
15) +16
16) +95
17) -39
18) +54
19) +96
20) +55
Let me know if you'd like this formatted as a printable worksheet or explained further!
Parent Tip: Review the logic above to help your child master the concept of integer addition and subtraction worksheet.
