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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 160 · 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. 1.18 × 8 =
  2. 2.16 × 8 =
  3. 3.18 × 4 =
  4. 4.75 × 4 =
  5. 5.51 × 4 =
  6. 6.26 × 8 =
  7. 7.22 × 8 =
  8. 8.24 × 8 =
  9. 9.12 × 8 =
  10. 10.13 × 8 =
  11. 11.30 × 8 =
  12. 12.17 × 8 =
  13. 13.27 × 8 =
  14. 14.29 × 8 =
  15. 15.39 × 8 =
  16. 16.34 × 4 =
  17. 17.34 × 8 =
  18. 18.30 × 4 =
  19. 19.19 × 8 =
  20. 20.35 × 4 =
  21. 21.38 × 4 =
  22. 22.61 × 4 =
  23. 23.32 × 8 =
  24. 24.74 × 4 =
  25. 25.66 × 4 =
  26. 26.72 × 4 =
  27. 27.25 × 4 =
  28. 28.33 × 8 =
  29. 29.40 × 8 =
  30. 30.40 × 4 =
  31. 31.14 × 8 =
  32. 32.62 × 4 =
  33. 33.20 × 8 =
  34. 34.32 × 4 =
  35. 35.23 × 8 =
  36. 36.63 × 4 =
  37. 37.67 × 4 =
  38. 38.45 × 4 =
  39. 39.28 × 4 =
  40. 40.47 × 4 =

Answer key

  1. 144
  2. 128
  3. 72
  4. 300
  5. 204
  6. 208
  7. 176
  8. 192
  9. 96
  10. 104
  11. 240
  12. 136
  13. 216
  14. 232
  15. 312
  16. 136
  17. 272
  18. 120
  19. 152
  20. 140
  21. 152
  22. 244
  23. 256
  24. 296
  25. 264
  26. 288
  27. 100
  28. 264
  29. 320
  30. 160
  31. 112
  32. 248
  33. 160
  34. 128
  35. 184
  36. 252
  37. 268
  38. 180
  39. 112
  40. 188

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