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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 621 · 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. 1.16 × 8 =
  2. 2.43 × 4 =
  3. 3.47 × 4 =
  4. 4.59 × 4 =
  5. 5.12 × 8 =
  6. 6.46 × 4 =
  7. 7.29 × 4 =
  8. 8.20 × 8 =
  9. 9.21 × 8 =
  10. 10.37 × 8 =
  11. 11.75 × 4 =
  12. 12.12 × 4 =
  13. 13.30 × 4 =
  14. 14.14 × 8 =
  15. 15.32 × 8 =
  16. 16.34 × 4 =
  17. 17.55 × 4 =
  18. 18.30 × 8 =
  19. 19.28 × 8 =
  20. 20.36 × 8 =
  21. 21.28 × 4 =
  22. 22.69 × 4 =
  23. 23.39 × 8 =
  24. 24.17 × 8 =
  25. 25.25 × 4 =
  26. 26.51 × 4 =
  27. 27.19 × 8 =
  28. 28.34 × 8 =
  29. 29.15 × 4 =
  30. 30.22 × 8 =
  31. 31.39 × 4 =
  32. 32.27 × 8 =
  33. 33.23 × 8 =
  34. 34.33 × 8 =
  35. 35.40 × 8 =
  36. 36.13 × 8 =
  37. 37.38 × 8 =
  38. 38.37 × 4 =
  39. 39.61 × 4 =
  40. 40.49 × 4 =

Answer key

  1. 128
  2. 172
  3. 188
  4. 236
  5. 96
  6. 184
  7. 116
  8. 160
  9. 168
  10. 296
  11. 300
  12. 48
  13. 120
  14. 112
  15. 256
  16. 136
  17. 220
  18. 240
  19. 224
  20. 288
  21. 112
  22. 276
  23. 312
  24. 136
  25. 100
  26. 204
  27. 152
  28. 272
  29. 60
  30. 176
  31. 156
  32. 216
  33. 184
  34. 264
  35. 320
  36. 104
  37. 304
  38. 148
  39. 244
  40. 196

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