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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 397 · 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 × 4 =
  2. 2.71 × 4 =
  3. 3.70 × 4 =
  4. 4.30 × 8 =
  5. 5.66 × 4 =
  6. 6.61 × 4 =
  7. 7.48 × 4 =
  8. 8.19 × 4 =
  9. 9.39 × 8 =
  10. 10.43 × 4 =
  11. 11.15 × 8 =
  12. 12.39 × 4 =
  13. 13.13 × 8 =
  14. 14.38 × 8 =
  15. 15.22 × 8 =
  16. 16.34 × 8 =
  17. 17.74 × 4 =
  18. 18.64 × 4 =
  19. 19.20 × 4 =
  20. 20.20 × 8 =
  21. 21.36 × 8 =
  22. 22.28 × 8 =
  23. 23.19 × 8 =
  24. 24.50 × 4 =
  25. 25.23 × 8 =
  26. 26.32 × 8 =
  27. 27.21 × 8 =
  28. 28.17 × 8 =
  29. 29.45 × 4 =
  30. 30.18 × 8 =
  31. 31.37 × 8 =
  32. 32.40 × 4 =
  33. 33.12 × 8 =
  34. 34.54 × 4 =
  35. 35.30 × 4 =
  36. 36.73 × 4 =
  37. 37.57 × 4 =
  38. 38.72 × 4 =
  39. 39.47 × 4 =
  40. 40.40 × 8 =

Answer key

  1. 72
  2. 284
  3. 280
  4. 240
  5. 264
  6. 244
  7. 192
  8. 76
  9. 312
  10. 172
  11. 120
  12. 156
  13. 104
  14. 304
  15. 176
  16. 272
  17. 296
  18. 256
  19. 80
  20. 160
  21. 288
  22. 224
  23. 152
  24. 200
  25. 184
  26. 256
  27. 168
  28. 136
  29. 180
  30. 144
  31. 296
  32. 160
  33. 96
  34. 216
  35. 120
  36. 292
  37. 228
  38. 288
  39. 188
  40. 320

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