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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 292 · 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. 1.36 × 8 =
  2. 2.16 × 8 =
  3. 3.12 × 8 =
  4. 4.20 × 8 =
  5. 5.29 × 4 =
  6. 6.15 × 4 =
  7. 7.17 × 8 =
  8. 8.19 × 8 =
  9. 9.33 × 4 =
  10. 10.36 × 4 =
  11. 11.70 × 4 =
  12. 12.19 × 4 =
  13. 13.28 × 8 =
  14. 14.21 × 8 =
  15. 15.72 × 4 =
  16. 16.30 × 4 =
  17. 17.66 × 4 =
  18. 18.54 × 4 =
  19. 19.33 × 8 =
  20. 20.15 × 8 =
  21. 21.62 × 4 =
  22. 22.23 × 8 =
  23. 23.28 × 4 =
  24. 24.24 × 4 =
  25. 25.35 × 8 =
  26. 26.30 × 8 =
  27. 27.55 × 4 =
  28. 28.21 × 4 =
  29. 29.43 × 4 =
  30. 30.40 × 4 =
  31. 31.20 × 4 =
  32. 32.75 × 4 =
  33. 33.38 × 8 =
  34. 34.29 × 8 =
  35. 35.71 × 4 =
  36. 36.46 × 4 =
  37. 37.14 × 8 =
  38. 38.57 × 4 =
  39. 39.44 × 4 =
  40. 40.35 × 4 =

Answer key

  1. 288
  2. 128
  3. 96
  4. 160
  5. 116
  6. 60
  7. 136
  8. 152
  9. 132
  10. 144
  11. 280
  12. 76
  13. 224
  14. 168
  15. 288
  16. 120
  17. 264
  18. 216
  19. 264
  20. 120
  21. 248
  22. 184
  23. 112
  24. 96
  25. 280
  26. 240
  27. 220
  28. 84
  29. 172
  30. 160
  31. 80
  32. 300
  33. 304
  34. 232
  35. 284
  36. 184
  37. 112
  38. 228
  39. 176
  40. 140

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