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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 402 · 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. 1.34 × 8 =
  2. 2.53 × 4 =
  3. 3.70 × 4 =
  4. 4.20 × 8 =
  5. 5.15 × 8 =
  6. 6.28 × 8 =
  7. 7.12 × 4 =
  8. 8.18 × 4 =
  9. 9.28 × 4 =
  10. 10.33 × 8 =
  11. 11.39 × 8 =
  12. 12.23 × 8 =
  13. 13.31 × 4 =
  14. 14.47 × 4 =
  15. 15.18 × 8 =
  16. 16.29 × 4 =
  17. 17.15 × 4 =
  18. 18.31 × 8 =
  19. 19.27 × 4 =
  20. 20.43 × 4 =
  21. 21.32 × 8 =
  22. 22.24 × 8 =
  23. 23.24 × 4 =
  24. 24.23 × 4 =
  25. 25.44 × 4 =
  26. 26.12 × 8 =
  27. 27.71 × 4 =
  28. 28.17 × 4 =
  29. 29.37 × 8 =
  30. 30.34 × 4 =
  31. 31.13 × 8 =
  32. 32.26 × 8 =
  33. 33.27 × 8 =
  34. 34.46 × 4 =
  35. 35.38 × 4 =
  36. 36.58 × 4 =
  37. 37.75 × 4 =
  38. 38.57 × 4 =
  39. 39.22 × 4 =
  40. 40.16 × 8 =

Answer key

  1. 272
  2. 212
  3. 280
  4. 160
  5. 120
  6. 224
  7. 48
  8. 72
  9. 112
  10. 264
  11. 312
  12. 184
  13. 124
  14. 188
  15. 144
  16. 116
  17. 60
  18. 248
  19. 108
  20. 172
  21. 256
  22. 192
  23. 96
  24. 92
  25. 176
  26. 96
  27. 284
  28. 68
  29. 296
  30. 136
  31. 104
  32. 208
  33. 216
  34. 184
  35. 152
  36. 232
  37. 300
  38. 228
  39. 88
  40. 128

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