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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 86 · 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. 1.12 × 8 =
  2. 2.37 × 8 =
  3. 3.25 × 8 =
  4. 4.48 × 4 =
  5. 5.57 × 4 =
  6. 6.30 × 4 =
  7. 7.28 × 8 =
  8. 8.22 × 8 =
  9. 9.35 × 4 =
  10. 10.31 × 4 =
  11. 11.70 × 4 =
  12. 12.46 × 4 =
  13. 13.14 × 8 =
  14. 14.18 × 4 =
  15. 15.34 × 8 =
  16. 16.38 × 4 =
  17. 17.38 × 8 =
  18. 18.36 × 4 =
  19. 19.25 × 4 =
  20. 20.32 × 8 =
  21. 21.26 × 4 =
  22. 22.30 × 8 =
  23. 23.17 × 4 =
  24. 24.16 × 8 =
  25. 25.23 × 8 =
  26. 26.18 × 8 =
  27. 27.63 × 4 =
  28. 28.58 × 4 =
  29. 29.40 × 4 =
  30. 30.36 × 8 =
  31. 31.39 × 4 =
  32. 32.40 × 8 =
  33. 33.29 × 8 =
  34. 34.39 × 8 =
  35. 35.52 × 4 =
  36. 36.27 × 8 =
  37. 37.68 × 4 =
  38. 38.71 × 4 =
  39. 39.20 × 8 =
  40. 40.21 × 8 =

Answer key

  1. 96
  2. 296
  3. 200
  4. 192
  5. 228
  6. 120
  7. 224
  8. 176
  9. 140
  10. 124
  11. 280
  12. 184
  13. 112
  14. 72
  15. 272
  16. 152
  17. 304
  18. 144
  19. 100
  20. 256
  21. 104
  22. 240
  23. 68
  24. 128
  25. 184
  26. 144
  27. 252
  28. 232
  29. 160
  30. 288
  31. 156
  32. 320
  33. 232
  34. 312
  35. 208
  36. 216
  37. 272
  38. 284
  39. 160
  40. 168

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