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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 757 · 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. 1.14 × 8 =
  2. 2.41 × 4 =
  3. 3.23 × 8 =
  4. 4.19 × 8 =
  5. 5.28 × 8 =
  6. 6.47 × 4 =
  7. 7.31 × 8 =
  8. 8.21 × 8 =
  9. 9.22 × 8 =
  10. 10.13 × 4 =
  11. 11.17 × 4 =
  12. 12.27 × 4 =
  13. 13.33 × 8 =
  14. 14.21 × 4 =
  15. 15.57 × 4 =
  16. 16.29 × 4 =
  17. 17.40 × 8 =
  18. 18.55 × 4 =
  19. 19.60 × 4 =
  20. 20.58 × 4 =
  21. 21.65 × 4 =
  22. 22.19 × 4 =
  23. 23.40 × 4 =
  24. 24.67 × 4 =
  25. 25.32 × 4 =
  26. 26.25 × 8 =
  27. 27.39 × 8 =
  28. 28.15 × 8 =
  29. 29.36 × 8 =
  30. 30.37 × 8 =
  31. 31.38 × 8 =
  32. 32.13 × 8 =
  33. 33.66 × 4 =
  34. 34.14 × 4 =
  35. 35.12 × 4 =
  36. 36.61 × 4 =
  37. 37.68 × 4 =
  38. 38.28 × 4 =
  39. 39.72 × 4 =
  40. 40.18 × 4 =

Answer key

  1. 112
  2. 164
  3. 184
  4. 152
  5. 224
  6. 188
  7. 248
  8. 168
  9. 176
  10. 52
  11. 68
  12. 108
  13. 264
  14. 84
  15. 228
  16. 116
  17. 320
  18. 220
  19. 240
  20. 232
  21. 260
  22. 76
  23. 160
  24. 268
  25. 128
  26. 200
  27. 312
  28. 120
  29. 288
  30. 296
  31. 304
  32. 104
  33. 264
  34. 56
  35. 48
  36. 244
  37. 272
  38. 112
  39. 288
  40. 72

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