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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 815 · 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. 1.62 × 4 =
  2. 2.23 × 4 =
  3. 3.52 × 4 =
  4. 4.15 × 8 =
  5. 5.16 × 8 =
  6. 6.35 × 8 =
  7. 7.64 × 4 =
  8. 8.14 × 4 =
  9. 9.28 × 8 =
  10. 10.23 × 8 =
  11. 11.71 × 4 =
  12. 12.19 × 4 =
  13. 13.24 × 4 =
  14. 14.43 × 4 =
  15. 15.69 × 4 =
  16. 16.16 × 4 =
  17. 17.39 × 8 =
  18. 18.29 × 8 =
  19. 19.34 × 8 =
  20. 20.36 × 8 =
  21. 21.31 × 8 =
  22. 22.25 × 4 =
  23. 23.26 × 8 =
  24. 24.44 × 4 =
  25. 25.41 × 4 =
  26. 26.24 × 8 =
  27. 27.18 × 8 =
  28. 28.30 × 8 =
  29. 29.13 × 4 =
  30. 30.53 × 4 =
  31. 31.21 × 8 =
  32. 32.14 × 8 =
  33. 33.45 × 4 =
  34. 34.65 × 4 =
  35. 35.40 × 4 =
  36. 36.68 × 4 =
  37. 37.60 × 4 =
  38. 38.19 × 8 =
  39. 39.37 × 4 =
  40. 40.32 × 8 =

Answer key

  1. 248
  2. 92
  3. 208
  4. 120
  5. 128
  6. 280
  7. 256
  8. 56
  9. 224
  10. 184
  11. 284
  12. 76
  13. 96
  14. 172
  15. 276
  16. 64
  17. 312
  18. 232
  19. 272
  20. 288
  21. 248
  22. 100
  23. 208
  24. 176
  25. 164
  26. 192
  27. 144
  28. 240
  29. 52
  30. 212
  31. 168
  32. 112
  33. 180
  34. 260
  35. 160
  36. 272
  37. 240
  38. 152
  39. 148
  40. 256

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