Let’s solve each problem step by step using a calculator (or careful math). We’ll check each one to make sure we get the right answer.
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1) 56 + 28 =
56 + 20 = 76
76 + 8 =
84
✔ Check: 56 + 28 → 6+8=14, carry 1; 5+2+1=8 → 84 ✔️
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2) 136 + 52 =
136 + 50 = 186
186 + 2 =
188
✔ Check: 6+2=8, 3+5=8, 1+0=1 → 188 ✔️
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3) 586 – 48 =
586 – 40 = 546
546 – 8 =
538
✔ Check: 6-8 can’t do → borrow: 16-8=8, then 7-4=3, 5 stays → 538 ✔️
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4) 128 × 3 =
100×3 = 300
20×3 = 60
8×3 = 24
300 + 60 = 360; 360 + 24 =
384
✔ Check: 128 × 3 → 8×3=24 (write 4, carry 2); 2×3=6+2=8; 1×3=3 → 384 ✔️
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5) 528 – 425 =
528 – 400 = 128
128 – 25 =
103
✔ Check: 8-5=3, 2-2=0, 5-4=1 → 103 ✔️
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6) 36 × 13 =
Break it down:
36 × 10 = 360
36 × 3 = 108
360 + 108 =
468
✔ Check: 36 × 13 → 6×3=18 (write 8, carry 1); 3×3=9+1=10 → write 0, carry 1; then 36×10=360 → add: 108 + 360 = 468 ✔️
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7) 285 ÷ 5 =
5 × 50 = 250
285 – 250 = 35
5 × 7 = 35
So 50 + 7 =
57
✔ Check: 5 × 57 = 285? 5×50=250, 5×7=35 → 250+35=285 ✔️
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8) 156 ÷ 2 =
Half of 156:
150 ÷ 2 = 75
6 ÷ 2 = 3
75 + 3 =
78
✔ Check: 2 × 78 = 156? 2×70=140, 2×8=16 → 140+16=156 ✔️
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9) 125 + 14 =
125 + 10 = 135
135 + 4 =
139
✔ Check: 5+4=9, 2+1=3, 1+0=1 → 139 ✔️
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10) 264 – 138 =
264 – 100 = 164
164 – 30 = 134
134 – 8 =
126
✔ Check: 4-8 can’t → borrow: 14-8=6; 5-3=2; 2-1=1 → 126 ✔️
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Final Answer:
1) 84
2) 188
3) 538
4) 384
5) 103
6) 468
7) 57
8) 78
9) 139
10) 126
Parent Tip: Review the logic above to help your child master the concept of calculator worksheet.
