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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 74 · 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. 1.43 × 4 =
  2. 2.39 × 8 =
  3. 3.66 × 4 =
  4. 4.16 × 8 =
  5. 5.21 × 8 =
  6. 6.67 × 4 =
  7. 7.32 × 8 =
  8. 8.18 × 8 =
  9. 9.22 × 8 =
  10. 10.60 × 4 =
  11. 11.16 × 4 =
  12. 12.21 × 4 =
  13. 13.14 × 8 =
  14. 14.34 × 8 =
  15. 15.17 × 4 =
  16. 16.17 × 8 =
  17. 17.51 × 4 =
  18. 18.35 × 4 =
  19. 19.28 × 8 =
  20. 20.50 × 4 =
  21. 21.73 × 4 =
  22. 22.46 × 4 =
  23. 23.35 × 8 =
  24. 24.20 × 8 =
  25. 25.26 × 8 =
  26. 26.12 × 4 =
  27. 27.29 × 4 =
  28. 28.15 × 4 =
  29. 29.33 × 4 =
  30. 30.44 × 4 =
  31. 31.57 × 4 =
  32. 32.59 × 4 =
  33. 33.54 × 4 =
  34. 34.18 × 4 =
  35. 35.68 × 4 =
  36. 36.36 × 8 =
  37. 37.53 × 4 =
  38. 38.38 × 8 =
  39. 39.48 × 4 =
  40. 40.37 × 4 =

Answer key

  1. 172
  2. 312
  3. 264
  4. 128
  5. 168
  6. 268
  7. 256
  8. 144
  9. 176
  10. 240
  11. 64
  12. 84
  13. 112
  14. 272
  15. 68
  16. 136
  17. 204
  18. 140
  19. 224
  20. 200
  21. 292
  22. 184
  23. 280
  24. 160
  25. 208
  26. 48
  27. 116
  28. 60
  29. 132
  30. 176
  31. 228
  32. 236
  33. 216
  34. 72
  35. 272
  36. 288
  37. 212
  38. 304
  39. 192
  40. 148

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