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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 806 · 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 × 4 =
  2. 2.55 × 4 =
  3. 3.36 × 4 =
  4. 4.18 × 4 =
  5. 5.52 × 4 =
  6. 6.70 × 4 =
  7. 7.38 × 8 =
  8. 8.40 × 8 =
  9. 9.24 × 8 =
  10. 10.23 × 8 =
  11. 11.56 × 4 =
  12. 12.19 × 4 =
  13. 13.63 × 4 =
  14. 14.33 × 4 =
  15. 15.21 × 4 =
  16. 16.46 × 4 =
  17. 17.25 × 8 =
  18. 18.57 × 4 =
  19. 19.16 × 8 =
  20. 20.14 × 4 =
  21. 21.22 × 8 =
  22. 22.29 × 4 =
  23. 23.37 × 8 =
  24. 24.33 × 8 =
  25. 25.71 × 4 =
  26. 26.73 × 4 =
  27. 27.40 × 4 =
  28. 28.43 × 4 =
  29. 29.38 × 4 =
  30. 30.37 × 4 =
  31. 31.27 × 4 =
  32. 32.39 × 8 =
  33. 33.12 × 4 =
  34. 34.45 × 4 =
  35. 35.30 × 4 =
  36. 36.15 × 8 =
  37. 37.27 × 8 =
  38. 38.53 × 4 =
  39. 39.36 × 8 =
  40. 40.69 × 4 =

Answer key

  1. 136
  2. 220
  3. 144
  4. 72
  5. 208
  6. 280
  7. 304
  8. 320
  9. 192
  10. 184
  11. 224
  12. 76
  13. 252
  14. 132
  15. 84
  16. 184
  17. 200
  18. 228
  19. 128
  20. 56
  21. 176
  22. 116
  23. 296
  24. 264
  25. 284
  26. 292
  27. 160
  28. 172
  29. 152
  30. 148
  31. 108
  32. 312
  33. 48
  34. 180
  35. 120
  36. 120
  37. 216
  38. 212
  39. 288
  40. 276

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