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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 294 · 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. 1.48 × 4 =
  2. 2.35 × 8 =
  3. 3.71 × 4 =
  4. 4.40 × 8 =
  5. 5.29 × 4 =
  6. 6.73 × 4 =
  7. 7.63 × 4 =
  8. 8.25 × 8 =
  9. 9.36 × 4 =
  10. 10.22 × 8 =
  11. 11.32 × 8 =
  12. 12.39 × 4 =
  13. 13.37 × 8 =
  14. 14.40 × 4 =
  15. 15.38 × 8 =
  16. 16.33 × 8 =
  17. 17.59 × 4 =
  18. 18.12 × 4 =
  19. 19.56 × 4 =
  20. 20.44 × 4 =
  21. 21.39 × 8 =
  22. 22.19 × 4 =
  23. 23.33 × 4 =
  24. 24.22 × 4 =
  25. 25.69 × 4 =
  26. 26.62 × 4 =
  27. 27.70 × 4 =
  28. 28.23 × 8 =
  29. 29.29 × 8 =
  30. 30.26 × 4 =
  31. 31.17 × 4 =
  32. 32.66 × 4 =
  33. 33.57 × 4 =
  34. 34.15 × 4 =
  35. 35.17 × 8 =
  36. 36.47 × 4 =
  37. 37.45 × 4 =
  38. 38.13 × 8 =
  39. 39.16 × 4 =
  40. 40.43 × 4 =

Answer key

  1. 192
  2. 280
  3. 284
  4. 320
  5. 116
  6. 292
  7. 252
  8. 200
  9. 144
  10. 176
  11. 256
  12. 156
  13. 296
  14. 160
  15. 304
  16. 264
  17. 236
  18. 48
  19. 224
  20. 176
  21. 312
  22. 76
  23. 132
  24. 88
  25. 276
  26. 248
  27. 280
  28. 184
  29. 232
  30. 104
  31. 68
  32. 264
  33. 228
  34. 60
  35. 136
  36. 188
  37. 180
  38. 104
  39. 64
  40. 172

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