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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 407 · 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. 1.74 × 4 =
  2. 2.13 × 8 =
  3. 3.14 × 8 =
  4. 4.60 × 4 =
  5. 5.73 × 4 =
  6. 6.50 × 4 =
  7. 7.65 × 4 =
  8. 8.40 × 4 =
  9. 9.13 × 4 =
  10. 10.17 × 8 =
  11. 11.16 × 8 =
  12. 12.39 × 4 =
  13. 13.19 × 4 =
  14. 14.42 × 4 =
  15. 15.32 × 8 =
  16. 16.55 × 4 =
  17. 17.37 × 4 =
  18. 18.20 × 4 =
  19. 19.48 × 4 =
  20. 20.67 × 4 =
  21. 21.23 × 4 =
  22. 22.40 × 8 =
  23. 23.31 × 4 =
  24. 24.25 × 4 =
  25. 25.21 × 4 =
  26. 26.29 × 4 =
  27. 27.26 × 8 =
  28. 28.12 × 8 =
  29. 29.69 × 4 =
  30. 30.22 × 8 =
  31. 31.30 × 4 =
  32. 32.24 × 8 =
  33. 33.59 × 4 =
  34. 34.68 × 4 =
  35. 35.51 × 4 =
  36. 36.35 × 8 =
  37. 37.28 × 8 =
  38. 38.23 × 8 =
  39. 39.17 × 4 =
  40. 40.58 × 4 =

Answer key

  1. 296
  2. 104
  3. 112
  4. 240
  5. 292
  6. 200
  7. 260
  8. 160
  9. 52
  10. 136
  11. 128
  12. 156
  13. 76
  14. 168
  15. 256
  16. 220
  17. 148
  18. 80
  19. 192
  20. 268
  21. 92
  22. 320
  23. 124
  24. 100
  25. 84
  26. 116
  27. 208
  28. 96
  29. 276
  30. 176
  31. 120
  32. 192
  33. 236
  34. 272
  35. 204
  36. 280
  37. 224
  38. 184
  39. 68
  40. 232

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