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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 790 · 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. 1.45 × 4 =
  2. 2.12 × 8 =
  3. 3.26 × 8 =
  4. 4.30 × 8 =
  5. 5.22 × 8 =
  6. 6.13 × 8 =
  7. 7.44 × 4 =
  8. 8.14 × 8 =
  9. 9.36 × 8 =
  10. 10.43 × 4 =
  11. 11.37 × 8 =
  12. 12.67 × 4 =
  13. 13.33 × 8 =
  14. 14.15 × 4 =
  15. 15.25 × 8 =
  16. 16.19 × 8 =
  17. 17.23 × 8 =
  18. 18.21 × 4 =
  19. 19.16 × 4 =
  20. 20.15 × 8 =
  21. 21.35 × 4 =
  22. 22.33 × 4 =
  23. 23.29 × 8 =
  24. 24.62 × 4 =
  25. 25.66 × 4 =
  26. 26.70 × 4 =
  27. 27.24 × 8 =
  28. 28.29 × 4 =
  29. 29.72 × 4 =
  30. 30.32 × 4 =
  31. 31.65 × 4 =
  32. 32.63 × 4 =
  33. 33.40 × 4 =
  34. 34.17 × 8 =
  35. 35.54 × 4 =
  36. 36.16 × 8 =
  37. 37.75 × 4 =
  38. 38.28 × 8 =
  39. 39.69 × 4 =
  40. 40.14 × 4 =

Answer key

  1. 180
  2. 96
  3. 208
  4. 240
  5. 176
  6. 104
  7. 176
  8. 112
  9. 288
  10. 172
  11. 296
  12. 268
  13. 264
  14. 60
  15. 200
  16. 152
  17. 184
  18. 84
  19. 64
  20. 120
  21. 140
  22. 132
  23. 232
  24. 248
  25. 264
  26. 280
  27. 192
  28. 116
  29. 288
  30. 128
  31. 260
  32. 252
  33. 160
  34. 136
  35. 216
  36. 128
  37. 300
  38. 224
  39. 276
  40. 56

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