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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 349 · 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. 1.32 × 4 =
  2. 2.28 × 8 =
  3. 3.14 × 4 =
  4. 4.29 × 8 =
  5. 5.25 × 8 =
  6. 6.12 × 8 =
  7. 7.57 × 4 =
  8. 8.40 × 8 =
  9. 9.49 × 4 =
  10. 10.26 × 8 =
  11. 11.13 × 8 =
  12. 12.63 × 4 =
  13. 13.29 × 4 =
  14. 14.71 × 4 =
  15. 15.43 × 4 =
  16. 16.66 × 4 =
  17. 17.23 × 8 =
  18. 18.12 × 4 =
  19. 19.26 × 4 =
  20. 20.35 × 8 =
  21. 21.16 × 8 =
  22. 22.52 × 4 =
  23. 23.28 × 4 =
  24. 24.33 × 8 =
  25. 25.59 × 4 =
  26. 26.18 × 4 =
  27. 27.30 × 4 =
  28. 28.40 × 4 =
  29. 29.39 × 4 =
  30. 30.21 × 8 =
  31. 31.69 × 4 =
  32. 32.56 × 4 =
  33. 33.13 × 4 =
  34. 34.54 × 4 =
  35. 35.55 × 4 =
  36. 36.61 × 4 =
  37. 37.27 × 4 =
  38. 38.20 × 8 =
  39. 39.23 × 4 =
  40. 40.34 × 4 =

Answer key

  1. 128
  2. 224
  3. 56
  4. 232
  5. 200
  6. 96
  7. 228
  8. 320
  9. 196
  10. 208
  11. 104
  12. 252
  13. 116
  14. 284
  15. 172
  16. 264
  17. 184
  18. 48
  19. 104
  20. 280
  21. 128
  22. 208
  23. 112
  24. 264
  25. 236
  26. 72
  27. 120
  28. 160
  29. 156
  30. 168
  31. 276
  32. 224
  33. 52
  34. 216
  35. 220
  36. 244
  37. 108
  38. 160
  39. 92
  40. 136

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