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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 40 · 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. 1.23 × 8 =
  2. 2.35 × 8 =
  3. 3.19 × 4 =
  4. 4.51 × 4 =
  5. 5.63 × 4 =
  6. 6.12 × 8 =
  7. 7.15 × 8 =
  8. 8.46 × 4 =
  9. 9.18 × 8 =
  10. 10.16 × 8 =
  11. 11.17 × 8 =
  12. 12.75 × 4 =
  13. 13.52 × 4 =
  14. 14.60 × 4 =
  15. 15.40 × 8 =
  16. 16.14 × 4 =
  17. 17.64 × 4 =
  18. 18.58 × 4 =
  19. 19.35 × 4 =
  20. 20.36 × 4 =
  21. 21.68 × 4 =
  22. 22.34 × 4 =
  23. 23.32 × 4 =
  24. 24.59 × 4 =
  25. 25.72 × 4 =
  26. 26.27 × 4 =
  27. 27.39 × 8 =
  28. 28.34 × 8 =
  29. 29.29 × 4 =
  30. 30.67 × 4 =
  31. 31.44 × 4 =
  32. 32.45 × 4 =
  33. 33.36 × 8 =
  34. 34.33 × 8 =
  35. 35.73 × 4 =
  36. 36.20 × 4 =
  37. 37.14 × 8 =
  38. 38.61 × 4 =
  39. 39.43 × 4 =
  40. 40.54 × 4 =

Answer key

  1. 184
  2. 280
  3. 76
  4. 204
  5. 252
  6. 96
  7. 120
  8. 184
  9. 144
  10. 128
  11. 136
  12. 300
  13. 208
  14. 240
  15. 320
  16. 56
  17. 256
  18. 232
  19. 140
  20. 144
  21. 272
  22. 136
  23. 128
  24. 236
  25. 288
  26. 108
  27. 312
  28. 272
  29. 116
  30. 268
  31. 176
  32. 180
  33. 288
  34. 264
  35. 292
  36. 80
  37. 112
  38. 244
  39. 172
  40. 216

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