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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 684 · 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. 1.19 × 8 =
  2. 2.32 × 8 =
  3. 3.37 × 8 =
  4. 4.39 × 8 =
  5. 5.14 × 8 =
  6. 6.23 × 4 =
  7. 7.23 × 8 =
  8. 8.72 × 4 =
  9. 9.62 × 4 =
  10. 10.45 × 4 =
  11. 11.30 × 8 =
  12. 12.41 × 4 =
  13. 13.27 × 8 =
  14. 14.16 × 8 =
  15. 15.33 × 4 =
  16. 16.15 × 8 =
  17. 17.59 × 4 =
  18. 18.50 × 4 =
  19. 19.68 × 4 =
  20. 20.74 × 4 =
  21. 21.18 × 4 =
  22. 22.29 × 8 =
  23. 23.63 × 4 =
  24. 24.40 × 8 =
  25. 25.75 × 4 =
  26. 26.43 × 4 =
  27. 27.19 × 4 =
  28. 28.70 × 4 =
  29. 29.25 × 8 =
  30. 30.27 × 4 =
  31. 31.29 × 4 =
  32. 32.35 × 4 =
  33. 33.12 × 4 =
  34. 34.26 × 8 =
  35. 35.28 × 8 =
  36. 36.20 × 8 =
  37. 37.24 × 8 =
  38. 38.32 × 4 =
  39. 39.38 × 4 =
  40. 40.53 × 4 =

Answer key

  1. 152
  2. 256
  3. 296
  4. 312
  5. 112
  6. 92
  7. 184
  8. 288
  9. 248
  10. 180
  11. 240
  12. 164
  13. 216
  14. 128
  15. 132
  16. 120
  17. 236
  18. 200
  19. 272
  20. 296
  21. 72
  22. 232
  23. 252
  24. 320
  25. 300
  26. 172
  27. 76
  28. 280
  29. 200
  30. 108
  31. 116
  32. 140
  33. 48
  34. 208
  35. 224
  36. 160
  37. 192
  38. 128
  39. 152
  40. 212

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