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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 474 · 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. 1.17 × 8 =
  2. 2.18 × 4 =
  3. 3.16 × 8 =
  4. 4.39 × 8 =
  5. 5.47 × 4 =
  6. 6.14 × 4 =
  7. 7.35 × 8 =
  8. 8.24 × 8 =
  9. 9.34 × 8 =
  10. 10.44 × 4 =
  11. 11.31 × 8 =
  12. 12.65 × 4 =
  13. 13.14 × 8 =
  14. 14.12 × 8 =
  15. 15.56 × 4 =
  16. 16.69 × 4 =
  17. 17.17 × 4 =
  18. 18.26 × 4 =
  19. 19.23 × 4 =
  20. 20.43 × 4 =
  21. 21.71 × 4 =
  22. 22.27 × 8 =
  23. 23.22 × 8 =
  24. 24.64 × 4 =
  25. 25.40 × 4 =
  26. 26.29 × 8 =
  27. 27.38 × 8 =
  28. 28.29 × 4 =
  29. 29.42 × 4 =
  30. 30.24 × 4 =
  31. 31.18 × 8 =
  32. 32.32 × 4 =
  33. 33.66 × 4 =
  34. 34.72 × 4 =
  35. 35.68 × 4 =
  36. 36.19 × 8 =
  37. 37.58 × 4 =
  38. 38.52 × 4 =
  39. 39.16 × 4 =
  40. 40.35 × 4 =

Answer key

  1. 136
  2. 72
  3. 128
  4. 312
  5. 188
  6. 56
  7. 280
  8. 192
  9. 272
  10. 176
  11. 248
  12. 260
  13. 112
  14. 96
  15. 224
  16. 276
  17. 68
  18. 104
  19. 92
  20. 172
  21. 284
  22. 216
  23. 176
  24. 256
  25. 160
  26. 232
  27. 304
  28. 116
  29. 168
  30. 96
  31. 144
  32. 128
  33. 264
  34. 288
  35. 272
  36. 152
  37. 232
  38. 208
  39. 64
  40. 140

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