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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 315 · 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. 1.40 × 8 =
  2. 2.33 × 4 =
  3. 3.30 × 4 =
  4. 4.17 × 8 =
  5. 5.34 × 8 =
  6. 6.63 × 4 =
  7. 7.12 × 4 =
  8. 8.16 × 8 =
  9. 9.72 × 4 =
  10. 10.20 × 8 =
  11. 11.22 × 8 =
  12. 12.74 × 4 =
  13. 13.28 × 8 =
  14. 14.50 × 4 =
  15. 15.19 × 4 =
  16. 16.57 × 4 =
  17. 17.30 × 8 =
  18. 18.16 × 4 =
  19. 19.38 × 8 =
  20. 20.13 × 8 =
  21. 21.15 × 8 =
  22. 22.69 × 4 =
  23. 23.75 × 4 =
  24. 24.21 × 8 =
  25. 25.56 × 4 =
  26. 26.68 × 4 =
  27. 27.37 × 8 =
  28. 28.44 × 4 =
  29. 29.23 × 8 =
  30. 30.26 × 8 =
  31. 31.14 × 8 =
  32. 32.24 × 8 =
  33. 33.19 × 8 =
  34. 34.29 × 8 =
  35. 35.41 × 4 =
  36. 36.29 × 4 =
  37. 37.43 × 4 =
  38. 38.52 × 4 =
  39. 39.18 × 4 =
  40. 40.13 × 4 =

Answer key

  1. 320
  2. 132
  3. 120
  4. 136
  5. 272
  6. 252
  7. 48
  8. 128
  9. 288
  10. 160
  11. 176
  12. 296
  13. 224
  14. 200
  15. 76
  16. 228
  17. 240
  18. 64
  19. 304
  20. 104
  21. 120
  22. 276
  23. 300
  24. 168
  25. 224
  26. 272
  27. 296
  28. 176
  29. 184
  30. 208
  31. 112
  32. 192
  33. 152
  34. 232
  35. 164
  36. 116
  37. 172
  38. 208
  39. 72
  40. 52

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