Grade 6 Mental Maths worksheet with addition, subtraction, multiplication, and division exercises.

Let's solve each problem step by step in the Mental Maths worksheet for Grade 6. I'll go through each section: Add, Subtract, Multiply, and Divide, and provide the answers with brief explanations where needed.

---

Add

1. 115 + 192
→ 115 + 192 = 307
*(100 + 100 = 200, 15 + 92 = 107; 200 + 107 = 307)*

2. 74 + 164
→ 74 + 164 = 238
*(70 + 160 = 230, 4 + 4 = 8; 230 + 8 = 238)*

3. 181 + 97
→ 181 + 97 = 278
*(181 + 100 = 281, minus 3 → 278)*

4. 263 + 85
→ 263 + 85 = 348
*(260 + 80 = 340, 3 + 5 = 8; 340 + 8 = 348)*

5. 468 + 119
→ 468 + 119 = 587
*(468 + 100 = 568, +19 = 587)*

6. 376 + 76
→ 376 + 76 = 452
*(376 + 70 = 446, +6 = 452)*

7. 82 + 241
→ 82 + 241 = 323
*(80 + 240 = 320, 2 + 1 = 3; 320 + 3 = 323)*

8. 167 + 39
→ 167 + 39 = 206
*(167 + 40 = 207, minus 1 → 206)*

9. 257 + 145
→ 257 + 145 = 402
*(250 + 140 = 390, 7 + 5 = 12; 390 + 12 = 402)*

10. 374 + 94
→ 374 + 94 = 468
*(374 + 100 = 474, minus 6 → 468)*

---

Subtract

1. 352 - 91
→ 352 - 91 = 261
*(352 - 90 = 262, minus 1 more → 261)*

2. 428 - 198
→ 428 - 198 = 230
*(428 - 200 = 228, add back 2 → 230)*

3. 217 - 160
→ 217 - 160 = 57
*(200 - 160 = 40, 17 → 57)*

4. 95 - 39
→ 95 - 39 = 56
*(95 - 40 = 55, add 1 → 56)*

5. 274 - 122
→ 274 - 122 = 152
*(274 - 100 = 174, -22 = 152)*

6. 152 - 131
→ 152 - 131 = 21
*(152 - 130 = 22, minus 1 → 21)*

7. 196 - 68
→ 196 - 68 = 128
*(196 - 70 = 126, add 2 → 128)*

8. 284 - 99
→ 284 - 99 = 185
*(284 - 100 = 184, add 1 → 185)*

9. 572 - 321
→ 572 - 321 = 251
*(572 - 300 = 272, -21 = 251)*

10. 724 - 89
→ 724 - 89 = 635
*(724 - 90 = 634, add 1 → 635)*

---

Multiply

1. 40 × 40
→ 40 × 40 = 1600
*(4 × 4 = 16, add two zeros → 1600)*

2. 80 × 50
→ 80 × 50 = 4000
*(8 × 5 = 40, add two zeros → 4000)*

3. 20 × 90
→ 20 × 90 = 1800
*(2 × 9 = 18, add two zeros → 1800)*

4. 60 × 60
→ 60 × 60 = 3600
*(6 × 6 = 36, add two zeros → 3600)*

5. 70 × 40
→ 70 × 40 = 2800
*(7 × 4 = 28, add two zeros → 2800)*

6. 800 × 40
→ 800 × 40 = 32,000
*(8 × 4 = 32, add three zeros → 32,000)*

7. 600 × 90
→ 600 × 90 = 54,000
*(6 × 9 = 54, add three zeros → 54,000)*

8. 70 × 800
→ 70 × 800 = 56,000
*(7 × 8 = 56, add three zeros → 56,000)*

9. 30 × 600
→ 30 × 600 = 18,000
*(3 × 6 = 18, add three zeros → 18,000)*

10. 40 × 400
→ 40 × 400 = 16,000
*(4 × 4 = 16, add three zeros → 16,000)*

---

Divide

1. 320 ÷ 40
→ 320 ÷ 40 = 8
*(32 ÷ 4 = 8)*

2. 640 ÷ 80
→ 640 ÷ 80 = 8
*(64 ÷ 8 = 8)*

3. 630 ÷ 90
→ 630 ÷ 90 = 7
*(63 ÷ 9 = 7)*

4. 240 ÷ 60
→ 240 ÷ 60 = 4
*(24 ÷ 6 = 4)*

5. 200 ÷ 40
→ 200 ÷ 40 = 5
*(20 ÷ 4 = 5)*

6. 720 ÷ 9
→ 720 ÷ 9 = 80
*(72 ÷ 9 = 8, so 720 ÷ 9 = 80)*

7. 810 ÷ 9
→ 810 ÷ 9 = 90
*(81 ÷ 9 = 9, so 810 ÷ 9 = 90)*

8. 210 ÷ 3
→ 210 ÷ 3 = 70
*(21 ÷ 3 = 7, so 210 ÷ 3 = 70)*

9. 420 ÷ 6
→ 420 ÷ 6 = 70
*(42 ÷ 6 = 7, so 420 ÷ 6 = 70)*

10. 480 ÷ 8
→ 480 ÷ 8 = 60
*(48 ÷ 8 = 6, so 480 ÷ 8 = 60)*

---

✔ Final Answers:

#### Add
1. 307
2. 238
3. 278
4. 348
5. 587
6. 452
7. 323
8. 206
9. 402
10. 468

#### Subtract
1. 261
2. 230
3. 57
4. 56
5. 152
6. 21
7. 128
8. 185
9. 251
10. 635

#### Multiply
1. 1600
2. 4000
3. 1800
4. 3600
5. 2800
6. 32,000
7. 54,000
8. 56,000
9. 18,000
10. 16,000

#### Divide
1. 8
2. 8
3. 7
4. 4
5. 5
6. 80
7. 90
8. 70
9. 70
10. 60

---

✔ All problems solved! This is a great mental maths practice sheet — perfect for building speed and accuracy in basic operations. Let me know if you'd like a printable version or tips for mental math tricks!