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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 327 · 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. 1.69 × 4 =
  2. 2.71 × 4 =
  3. 3.25 × 4 =
  4. 4.38 × 8 =
  5. 5.21 × 4 =
  6. 6.25 × 8 =
  7. 7.15 × 8 =
  8. 8.18 × 8 =
  9. 9.46 × 4 =
  10. 10.24 × 8 =
  11. 11.23 × 8 =
  12. 12.35 × 8 =
  13. 13.20 × 4 =
  14. 14.16 × 8 =
  15. 15.27 × 4 =
  16. 16.44 × 4 =
  17. 17.19 × 8 =
  18. 18.27 × 8 =
  19. 19.40 × 4 =
  20. 20.54 × 4 =
  21. 21.73 × 4 =
  22. 22.13 × 4 =
  23. 23.50 × 4 =
  24. 24.38 × 4 =
  25. 25.49 × 4 =
  26. 26.62 × 4 =
  27. 27.29 × 4 =
  28. 28.17 × 4 =
  29. 29.33 × 8 =
  30. 30.65 × 4 =
  31. 31.13 × 8 =
  32. 32.28 × 8 =
  33. 33.29 × 8 =
  34. 34.39 × 8 =
  35. 35.16 × 4 =
  36. 36.57 × 4 =
  37. 37.34 × 8 =
  38. 38.41 × 4 =
  39. 39.34 × 4 =
  40. 40.37 × 8 =

Answer key

  1. 276
  2. 284
  3. 100
  4. 304
  5. 84
  6. 200
  7. 120
  8. 144
  9. 184
  10. 192
  11. 184
  12. 280
  13. 80
  14. 128
  15. 108
  16. 176
  17. 152
  18. 216
  19. 160
  20. 216
  21. 292
  22. 52
  23. 200
  24. 152
  25. 196
  26. 248
  27. 116
  28. 68
  29. 264
  30. 260
  31. 104
  32. 224
  33. 232
  34. 312
  35. 64
  36. 228
  37. 272
  38. 164
  39. 136
  40. 296

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