Here are the solutions to the addition problems. I have calculated each one step-by-step to ensure accuracy.
1) (+30) + (+43)
Both numbers are positive, so we add them together: $30 + 43 = 73$.
2) (+31) + (+82)
Both numbers are positive: $31 + 82 = 113$.
3) (-84) + (+21)
The signs are different. We subtract the smaller number from the larger number ($84 - 21 = 63$). Since the larger number (84) is negative, the answer is negative: $-63$.
4) (+70) + (+57)
Both numbers are positive: $70 + 57 = 127$.
5) (+68) + (+16)
Both numbers are positive: $68 + 16 = 84$.
6) (-8) + (+36)
The signs are different. Subtract the smaller from the larger ($36 - 8 = 28$). The larger number (36) is positive, so the answer is positive: $+28$.
7) (+2) + (+16)
Both numbers are positive: $2 + 16 = 18$.
8) (-84) + (+35)
The signs are different. Subtract the smaller from the larger ($84 - 35 = 49$). The larger number (84) is negative, so the answer is negative: $-49$.
9) (+85) + (+58)
Both numbers are positive: $85 + 58 = 143$.
10) (+77) + (+46)
Both numbers are positive: $77 + 46 = 123$.
11) (+71) + (+41)
Both numbers are positive: $71 + 41 = 112$.
12) (+74) + (+9)
Both numbers are positive: $74 + 9 = 83$.
13) (+86) + (-91)
The signs are different. Subtract the smaller from the larger ($91 - 86 = 5$). The larger number (91) is negative, so the answer is negative: $-5$.
14) (+35) + (+90)
Both numbers are positive: $35 + 90 = 125$.
15) (+71) + (-55)
The signs are different. Subtract the smaller from the larger ($71 - 55 = 16$). The larger number (71) is positive, so the answer is positive: $+16$.
16) (+38) + (+57)
Both numbers are positive: $38 + 57 = 95$.
17) (-37) + (-2)
Both numbers are negative, so we add their values and keep the negative sign: $37 + 2 = 39$, so the answer is $-39$.
18) (+3) + (+51)
Both numbers are positive: $3 + 51 = 54$.
19) (+84) + (+12)
Both numbers are positive: $84 + 12 = 96$.
20) (+86) + (-31)
The signs are different. Subtract the smaller from the larger ($86 - 31 = 55$). The larger number (86) is positive, so the answer is positive: $+55$.
Final Answer:
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
Parent Tip: Review the logic above to help your child master the concept of subtracting and adding integers worksheet.
