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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 550 · 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. 1.21 × 8 =
  2. 2.69 × 4 =
  3. 3.54 × 4 =
  4. 4.59 × 4 =
  5. 5.49 × 4 =
  6. 6.20 × 8 =
  7. 7.22 × 4 =
  8. 8.72 × 4 =
  9. 9.14 × 4 =
  10. 10.17 × 4 =
  11. 11.17 × 8 =
  12. 12.67 × 4 =
  13. 13.68 × 4 =
  14. 14.32 × 8 =
  15. 15.31 × 4 =
  16. 16.57 × 4 =
  17. 17.26 × 8 =
  18. 18.40 × 8 =
  19. 19.37 × 8 =
  20. 20.30 × 8 =
  21. 21.18 × 8 =
  22. 22.30 × 4 =
  23. 23.55 × 4 =
  24. 24.13 × 8 =
  25. 25.22 × 8 =
  26. 26.15 × 8 =
  27. 27.38 × 8 =
  28. 28.36 × 4 =
  29. 29.19 × 8 =
  30. 30.71 × 4 =
  31. 31.53 × 4 =
  32. 32.25 × 8 =
  33. 33.40 × 4 =
  34. 34.12 × 4 =
  35. 35.34 × 8 =
  36. 36.16 × 8 =
  37. 37.23 × 8 =
  38. 38.35 × 4 =
  39. 39.14 × 8 =
  40. 40.56 × 4 =

Answer key

  1. 168
  2. 276
  3. 216
  4. 236
  5. 196
  6. 160
  7. 88
  8. 288
  9. 56
  10. 68
  11. 136
  12. 268
  13. 272
  14. 256
  15. 124
  16. 228
  17. 208
  18. 320
  19. 296
  20. 240
  21. 144
  22. 120
  23. 220
  24. 104
  25. 176
  26. 120
  27. 304
  28. 144
  29. 152
  30. 284
  31. 212
  32. 200
  33. 160
  34. 48
  35. 272
  36. 128
  37. 184
  38. 140
  39. 112
  40. 224

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