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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 431 · 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 91 =
  2. 2.Half of 190 =
  3. 3.Half of 104 =
  4. 4.Double 36 =
  5. 5.Half of 180 =
  6. 6.Half of 54 =
  7. 7.Half of 92 =
  8. 8.Double 57 =
  9. 9.Double 67 =
  10. 10.Half of 154 =
  11. 11.Half of 66 =
  12. 12.Half of 172 =
  13. 13.Half of 120 =
  14. 14.Double 66 =
  15. 15.Half of 184 =
  16. 16.Half of 196 =
  17. 17.Half of 162 =
  18. 18.Half of 192 =
  19. 19.Half of 74 =
  20. 20.Double 51 =
  21. 21.Half of 46 =
  22. 22.Half of 50 =
  23. 23.Half of 182 =
  24. 24.Double 16 =
  25. 25.Double 65 =
  26. 26.Half of 84 =
  27. 27.Half of 76 =
  28. 28.Double 31 =
  29. 29.Half of 156 =
  30. 30.Double 86 =
  31. 31.Half of 142 =
  32. 32.Half of 56 =
  33. 33.Half of 174 =
  34. 34.Half of 26 =
  35. 35.Half of 42 =
  36. 36.Half of 30 =
  37. 37.Double 62 =
  38. 38.Half of 52 =
  39. 39.Double 82 =
  40. 40.Double 64 =

Answer key

  1. 182
  2. 95
  3. 52
  4. 72
  5. 90
  6. 27
  7. 46
  8. 114
  9. 134
  10. 77
  11. 33
  12. 86
  13. 60
  14. 132
  15. 92
  16. 98
  17. 81
  18. 96
  19. 37
  20. 102
  21. 23
  22. 25
  23. 91
  24. 32
  25. 130
  26. 42
  27. 38
  28. 62
  29. 78
  30. 172
  31. 71
  32. 28
  33. 87
  34. 13
  35. 21
  36. 15
  37. 124
  38. 26
  39. 164
  40. 128

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