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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 478 · 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. 1.38 × 4 =
  2. 2.51 × 4 =
  3. 3.71 × 4 =
  4. 4.48 × 4 =
  5. 5.63 × 4 =
  6. 6.41 × 4 =
  7. 7.18 × 8 =
  8. 8.57 × 4 =
  9. 9.30 × 8 =
  10. 10.35 × 8 =
  11. 11.14 × 8 =
  12. 12.65 × 4 =
  13. 13.64 × 4 =
  14. 14.33 × 8 =
  15. 15.74 × 4 =
  16. 16.34 × 8 =
  17. 17.12 × 8 =
  18. 18.18 × 4 =
  19. 19.25 × 4 =
  20. 20.53 × 4 =
  21. 21.69 × 4 =
  22. 22.36 × 4 =
  23. 23.32 × 8 =
  24. 24.44 × 4 =
  25. 25.39 × 4 =
  26. 26.73 × 4 =
  27. 27.28 × 8 =
  28. 28.19 × 4 =
  29. 29.15 × 8 =
  30. 30.35 × 4 =
  31. 31.20 × 8 =
  32. 32.31 × 4 =
  33. 33.19 × 8 =
  34. 34.36 × 8 =
  35. 35.23 × 8 =
  36. 36.67 × 4 =
  37. 37.40 × 4 =
  38. 38.45 × 4 =
  39. 39.24 × 4 =
  40. 40.13 × 8 =

Answer key

  1. 152
  2. 204
  3. 284
  4. 192
  5. 252
  6. 164
  7. 144
  8. 228
  9. 240
  10. 280
  11. 112
  12. 260
  13. 256
  14. 264
  15. 296
  16. 272
  17. 96
  18. 72
  19. 100
  20. 212
  21. 276
  22. 144
  23. 256
  24. 176
  25. 156
  26. 292
  27. 224
  28. 76
  29. 120
  30. 140
  31. 160
  32. 124
  33. 152
  34. 288
  35. 184
  36. 268
  37. 160
  38. 180
  39. 96
  40. 104

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