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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 489 · 40 questions
TalentJR

How to do it in your head (Double, double, double): × 2: double once. × 4: double, then double again. × 8: double three times.

NameDateTime takenScore ___ / 40
  1. 1.21 × 8 =
  2. 2.33 × 4 =
  3. 3.28 × 8 =
  4. 4.12 × 4 =
  5. 5.46 × 4 =
  6. 6.28 × 4 =
  7. 7.61 × 4 =
  8. 8.31 × 8 =
  9. 9.74 × 4 =
  10. 10.15 × 8 =
  11. 11.30 × 8 =
  12. 12.34 × 8 =
  13. 13.53 × 4 =
  14. 14.36 × 8 =
  15. 15.58 × 4 =
  16. 16.27 × 8 =
  17. 17.48 × 4 =
  18. 18.25 × 8 =
  19. 19.39 × 8 =
  20. 20.16 × 4 =
  21. 21.20 × 8 =
  22. 22.69 × 4 =
  23. 23.23 × 8 =
  24. 24.38 × 4 =
  25. 25.35 × 4 =
  26. 26.42 × 4 =
  27. 27.22 × 8 =
  28. 28.17 × 8 =
  29. 29.52 × 4 =
  30. 30.55 × 4 =
  31. 31.20 × 4 =
  32. 32.72 × 4 =
  33. 33.34 × 4 =
  34. 34.35 × 8 =
  35. 35.66 × 4 =
  36. 36.12 × 8 =
  37. 37.24 × 4 =
  38. 38.57 × 4 =
  39. 39.43 × 4 =
  40. 40.15 × 4 =

Answer key

  1. 168
  2. 132
  3. 224
  4. 48
  5. 184
  6. 112
  7. 244
  8. 248
  9. 296
  10. 120
  11. 240
  12. 272
  13. 212
  14. 288
  15. 232
  16. 216
  17. 192
  18. 200
  19. 312
  20. 64
  21. 160
  22. 276
  23. 184
  24. 152
  25. 140
  26. 168
  27. 176
  28. 136
  29. 208
  30. 220
  31. 80
  32. 288
  33. 136
  34. 280
  35. 264
  36. 96
  37. 96
  38. 228
  39. 172
  40. 60

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