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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 542 · 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. 1.18 × 8 =
  2. 2.26 × 8 =
  3. 3.32 × 8 =
  4. 4.16 × 8 =
  5. 5.19 × 4 =
  6. 6.71 × 4 =
  7. 7.23 × 8 =
  8. 8.29 × 4 =
  9. 9.59 × 4 =
  10. 10.33 × 8 =
  11. 11.73 × 4 =
  12. 12.19 × 8 =
  13. 13.12 × 8 =
  14. 14.68 × 4 =
  15. 15.55 × 4 =
  16. 16.27 × 4 =
  17. 17.65 × 4 =
  18. 18.63 × 4 =
  19. 19.24 × 8 =
  20. 20.23 × 4 =
  21. 21.40 × 4 =
  22. 22.38 × 4 =
  23. 23.36 × 4 =
  24. 24.28 × 4 =
  25. 25.61 × 4 =
  26. 26.34 × 4 =
  27. 27.67 × 4 =
  28. 28.17 × 4 =
  29. 29.25 × 8 =
  30. 30.38 × 8 =
  31. 31.30 × 4 =
  32. 32.39 × 4 =
  33. 33.49 × 4 =
  34. 34.41 × 4 =
  35. 35.27 × 8 =
  36. 36.74 × 4 =
  37. 37.20 × 8 =
  38. 38.31 × 8 =
  39. 39.40 × 8 =
  40. 40.15 × 8 =

Answer key

  1. 144
  2. 208
  3. 256
  4. 128
  5. 76
  6. 284
  7. 184
  8. 116
  9. 236
  10. 264
  11. 292
  12. 152
  13. 96
  14. 272
  15. 220
  16. 108
  17. 260
  18. 252
  19. 192
  20. 92
  21. 160
  22. 152
  23. 144
  24. 112
  25. 244
  26. 136
  27. 268
  28. 68
  29. 200
  30. 304
  31. 120
  32. 156
  33. 196
  34. 164
  35. 216
  36. 296
  37. 160
  38. 248
  39. 320
  40. 120

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