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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 798 · 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 93 =
  2. 2.Half of 72 =
  3. 3.Half of 66 =
  4. 4.Half of 48 =
  5. 5.Double 27 =
  6. 6.Double 19 =
  7. 7.Half of 94 =
  8. 8.Double 46 =
  9. 9.Double 26 =
  10. 10.Half of 138 =
  11. 11.Double 69 =
  12. 12.Double 39 =
  13. 13.Double 41 =
  14. 14.Half of 62 =
  15. 15.Double 55 =
  16. 16.Double 81 =
  17. 17.Half of 188 =
  18. 18.Half of 50 =
  19. 19.Double 61 =
  20. 20.Double 71 =
  21. 21.Double 21 =
  22. 22.Double 38 =
  23. 23.Double 84 =
  24. 24.Double 64 =
  25. 25.Half of 182 =
  26. 26.Double 75 =
  27. 27.Half of 68 =
  28. 28.Half of 130 =
  29. 29.Half of 118 =
  30. 30.Half of 106 =
  31. 31.Double 63 =
  32. 32.Double 31 =
  33. 33.Half of 104 =
  34. 34.Double 98 =
  35. 35.Double 24 =
  36. 36.Half of 86 =
  37. 37.Double 25 =
  38. 38.Half of 58 =
  39. 39.Half of 176 =
  40. 40.Double 95 =

Answer key

  1. 186
  2. 36
  3. 33
  4. 24
  5. 54
  6. 38
  7. 47
  8. 92
  9. 52
  10. 69
  11. 138
  12. 78
  13. 82
  14. 31
  15. 110
  16. 162
  17. 94
  18. 25
  19. 122
  20. 142
  21. 42
  22. 76
  23. 168
  24. 128
  25. 91
  26. 150
  27. 34
  28. 65
  29. 59
  30. 53
  31. 126
  32. 62
  33. 52
  34. 196
  35. 48
  36. 43
  37. 50
  38. 29
  39. 88
  40. 190

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