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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 138 · 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 57 =
  2. 2.Half of 174 =
  3. 3.Double 25 =
  4. 4.Half of 64 =
  5. 5.Half of 66 =
  6. 6.Half of 140 =
  7. 7.Half of 162 =
  8. 8.Half of 178 =
  9. 9.Double 36 =
  10. 10.Half of 134 =
  11. 11.Half of 76 =
  12. 12.Half of 52 =
  13. 13.Double 51 =
  14. 14.Half of 154 =
  15. 15.Double 64 =
  16. 16.Half of 28 =
  17. 17.Double 78 =
  18. 18.Double 72 =
  19. 19.Half of 108 =
  20. 20.Half of 86 =
  21. 21.Double 24 =
  22. 22.Double 61 =
  23. 23.Half of 44 =
  24. 24.Double 53 =
  25. 25.Double 59 =
  26. 26.Double 75 =
  27. 27.Double 19 =
  28. 28.Double 97 =
  29. 29.Double 63 =
  30. 30.Half of 180 =
  31. 31.Double 87 =
  32. 32.Half of 72 =
  33. 33.Double 33 =
  34. 34.Half of 62 =
  35. 35.Double 99 =
  36. 36.Double 62 =
  37. 37.Half of 58 =
  38. 38.Half of 82 =
  39. 39.Half of 176 =
  40. 40.Half of 170 =

Answer key

  1. 114
  2. 87
  3. 50
  4. 32
  5. 33
  6. 70
  7. 81
  8. 89
  9. 72
  10. 67
  11. 38
  12. 26
  13. 102
  14. 77
  15. 128
  16. 14
  17. 156
  18. 144
  19. 54
  20. 43
  21. 48
  22. 122
  23. 22
  24. 106
  25. 118
  26. 150
  27. 38
  28. 194
  29. 126
  30. 90
  31. 174
  32. 36
  33. 66
  34. 31
  35. 198
  36. 124
  37. 29
  38. 41
  39. 88
  40. 85

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