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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 795 · 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.Half of 170 =
  2. 2.Half of 50 =
  3. 3.Double 91 =
  4. 4.Double 23 =
  5. 5.Double 78 =
  6. 6.Double 44 =
  7. 7.Double 58 =
  8. 8.Double 73 =
  9. 9.Double 39 =
  10. 10.Double 17 =
  11. 11.Double 31 =
  12. 12.Double 81 =
  13. 13.Half of 102 =
  14. 14.Double 27 =
  15. 15.Double 96 =
  16. 16.Double 18 =
  17. 17.Double 62 =
  18. 18.Double 51 =
  19. 19.Half of 144 =
  20. 20.Double 29 =
  21. 21.Half of 116 =
  22. 22.Double 41 =
  23. 23.Double 56 =
  24. 24.Half of 136 =
  25. 25.Half of 182 =
  26. 26.Half of 32 =
  27. 27.Double 88 =
  28. 28.Half of 70 =
  29. 29.Double 24 =
  30. 30.Half of 84 =
  31. 31.Half of 76 =
  32. 32.Double 99 =
  33. 33.Half of 66 =
  34. 34.Half of 64 =
  35. 35.Half of 48 =
  36. 36.Double 53 =
  37. 37.Double 79 =
  38. 38.Double 75 =
  39. 39.Half of 88 =
  40. 40.Half of 152 =

Answer key

  1. 85
  2. 25
  3. 182
  4. 46
  5. 156
  6. 88
  7. 116
  8. 146
  9. 78
  10. 34
  11. 62
  12. 162
  13. 51
  14. 54
  15. 192
  16. 36
  17. 124
  18. 102
  19. 72
  20. 58
  21. 58
  22. 82
  23. 112
  24. 68
  25. 91
  26. 16
  27. 176
  28. 35
  29. 48
  30. 42
  31. 38
  32. 198
  33. 33
  34. 32
  35. 24
  36. 106
  37. 158
  38. 150
  39. 44
  40. 76

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