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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 609 · 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. 1.39 × 8 =
  2. 2.16 × 8 =
  3. 3.49 × 4 =
  4. 4.32 × 8 =
  5. 5.20 × 8 =
  6. 6.40 × 4 =
  7. 7.15 × 8 =
  8. 8.31 × 8 =
  9. 9.12 × 4 =
  10. 10.24 × 4 =
  11. 11.22 × 4 =
  12. 12.44 × 4 =
  13. 13.68 × 4 =
  14. 14.18 × 8 =
  15. 15.20 × 4 =
  16. 16.43 × 4 =
  17. 17.19 × 8 =
  18. 18.34 × 8 =
  19. 19.37 × 8 =
  20. 20.27 × 4 =
  21. 21.13 × 8 =
  22. 22.30 × 8 =
  23. 23.63 × 4 =
  24. 24.17 × 8 =
  25. 25.59 × 4 =
  26. 26.26 × 4 =
  27. 27.28 × 8 =
  28. 28.58 × 4 =
  29. 29.36 × 8 =
  30. 30.50 × 4 =
  31. 31.16 × 4 =
  32. 32.42 × 4 =
  33. 33.52 × 4 =
  34. 34.33 × 4 =
  35. 35.66 × 4 =
  36. 36.48 × 4 =
  37. 37.39 × 4 =
  38. 38.25 × 8 =
  39. 39.47 × 4 =
  40. 40.17 × 4 =

Answer key

  1. 312
  2. 128
  3. 196
  4. 256
  5. 160
  6. 160
  7. 120
  8. 248
  9. 48
  10. 96
  11. 88
  12. 176
  13. 272
  14. 144
  15. 80
  16. 172
  17. 152
  18. 272
  19. 296
  20. 108
  21. 104
  22. 240
  23. 252
  24. 136
  25. 236
  26. 104
  27. 224
  28. 232
  29. 288
  30. 200
  31. 64
  32. 168
  33. 208
  34. 132
  35. 264
  36. 192
  37. 156
  38. 200
  39. 188
  40. 68

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