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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 909 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 19 =
  2. 2.Double 46 =
  3. 3.Double 36 =
  4. 4.Half of 28 =
  5. 5.Half of 148 =
  6. 6.Double 98 =
  7. 7.Half of 106 =
  8. 8.Half of 70 =
  9. 9.Half of 194 =
  10. 10.Double 27 =
  11. 11.Double 51 =
  12. 12.Half of 82 =
  13. 13.Double 61 =
  14. 14.Half of 74 =
  15. 15.Double 86 =
  16. 16.Half of 190 =
  17. 17.Half of 172 =
  18. 18.Double 42 =
  19. 19.Half of 112 =
  20. 20.Double 44 =
  21. 21.Double 38 =
  22. 22.Half of 162 =
  23. 23.Double 48 =
  24. 24.Half of 168 =
  25. 25.Half of 60 =
  26. 26.Double 92 =
  27. 27.Half of 58 =
  28. 28.Double 89 =
  29. 29.Double 49 =
  30. 30.Double 28 =
  31. 31.Half of 68 =
  32. 32.Double 76 =
  33. 33.Half of 62 =
  34. 34.Double 24 =
  35. 35.Double 39 =
  36. 36.Half of 128 =
  37. 37.Half of 120 =
  38. 38.Half of 30 =
  39. 39.Half of 186 =
  40. 40.Half of 158 =

Answer key

  1. 38
  2. 92
  3. 72
  4. 14
  5. 74
  6. 196
  7. 53
  8. 35
  9. 97
  10. 54
  11. 102
  12. 41
  13. 122
  14. 37
  15. 172
  16. 95
  17. 86
  18. 84
  19. 56
  20. 88
  21. 76
  22. 81
  23. 96
  24. 84
  25. 30
  26. 184
  27. 29
  28. 178
  29. 98
  30. 56
  31. 34
  32. 152
  33. 31
  34. 48
  35. 78
  36. 64
  37. 60
  38. 15
  39. 93
  40. 79

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