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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 284 · 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. 2.64 × 4 =
  3. 3.69 × 4 =
  4. 4.15 × 4 =
  5. 5.27 × 4 =
  6. 6.37 × 4 =
  7. 7.14 × 4 =
  8. 8.40 × 8 =
  9. 9.55 × 4 =
  10. 10.12 × 8 =
  11. 11.37 × 8 =
  12. 12.27 × 8 =
  13. 13.29 × 8 =
  14. 14.38 × 8 =
  15. 15.60 × 4 =
  16. 16.57 × 4 =
  17. 17.31 × 4 =
  18. 18.15 × 8 =
  19. 19.17 × 8 =
  20. 20.24 × 4 =
  21. 21.33 × 8 =
  22. 22.44 × 4 =
  23. 23.42 × 4 =
  24. 24.31 × 8 =
  25. 25.20 × 8 =
  26. 26.28 × 8 =
  27. 27.47 × 4 =
  28. 28.30 × 8 =
  29. 29.23 × 8 =
  30. 30.40 × 4 =
  31. 31.35 × 8 =
  32. 32.13 × 8 =
  33. 33.18 × 4 =
  34. 34.71 × 4 =
  35. 35.59 × 4 =
  36. 36.17 × 4 =
  37. 37.54 × 4 =
  38. 38.20 × 4 =
  39. 39.35 × 4 =
  40. 40.21 × 8 =

Answer key

  1. 144
  2. 256
  3. 276
  4. 60
  5. 108
  6. 148
  7. 56
  8. 320
  9. 220
  10. 96
  11. 296
  12. 216
  13. 232
  14. 304
  15. 240
  16. 228
  17. 124
  18. 120
  19. 136
  20. 96
  21. 264
  22. 176
  23. 168
  24. 248
  25. 160
  26. 224
  27. 188
  28. 240
  29. 184
  30. 160
  31. 280
  32. 104
  33. 72
  34. 284
  35. 236
  36. 68
  37. 216
  38. 80
  39. 140
  40. 168

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