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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 174 · 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. 2.21 × 8 =
  3. 3.32 × 8 =
  4. 4.40 × 8 =
  5. 5.30 × 4 =
  6. 6.34 × 8 =
  7. 7.27 × 4 =
  8. 8.55 × 4 =
  9. 9.67 × 4 =
  10. 10.35 × 8 =
  11. 11.69 × 4 =
  12. 12.53 × 4 =
  13. 13.49 × 4 =
  14. 14.14 × 4 =
  15. 15.44 × 4 =
  16. 16.43 × 4 =
  17. 17.51 × 4 =
  18. 18.33 × 8 =
  19. 19.71 × 4 =
  20. 20.40 × 4 =
  21. 21.57 × 4 =
  22. 22.14 × 8 =
  23. 23.30 × 8 =
  24. 24.19 × 8 =
  25. 25.21 × 4 =
  26. 26.31 × 8 =
  27. 27.31 × 4 =
  28. 28.28 × 8 =
  29. 29.12 × 8 =
  30. 30.36 × 8 =
  31. 31.18 × 8 =
  32. 32.34 × 4 =
  33. 33.27 × 8 =
  34. 34.62 × 4 =
  35. 35.39 × 8 =
  36. 36.60 × 4 =
  37. 37.63 × 4 =
  38. 38.73 × 4 =
  39. 39.18 × 4 =
  40. 40.47 × 4 =

Answer key

  1. 128
  2. 168
  3. 256
  4. 320
  5. 120
  6. 272
  7. 108
  8. 220
  9. 268
  10. 280
  11. 276
  12. 212
  13. 196
  14. 56
  15. 176
  16. 172
  17. 204
  18. 264
  19. 284
  20. 160
  21. 228
  22. 112
  23. 240
  24. 152
  25. 84
  26. 248
  27. 124
  28. 224
  29. 96
  30. 288
  31. 144
  32. 136
  33. 216
  34. 248
  35. 312
  36. 240
  37. 252
  38. 292
  39. 72
  40. 188

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