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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 821 · 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 51 =
  2. 2.Half of 98 =
  3. 3.Half of 58 =
  4. 4.Double 68 =
  5. 5.Double 56 =
  6. 6.Half of 160 =
  7. 7.Half of 168 =
  8. 8.Half of 144 =
  9. 9.Double 87 =
  10. 10.Half of 106 =
  11. 11.Double 78 =
  12. 12.Half of 130 =
  13. 13.Half of 42 =
  14. 14.Double 26 =
  15. 15.Half of 124 =
  16. 16.Double 64 =
  17. 17.Double 31 =
  18. 18.Half of 70 =
  19. 19.Half of 26 =
  20. 20.Double 41 =
  21. 21.Double 66 =
  22. 22.Half of 100 =
  23. 23.Double 34 =
  24. 24.Double 57 =
  25. 25.Double 61 =
  26. 26.Double 55 =
  27. 27.Half of 136 =
  28. 28.Half of 176 =
  29. 29.Double 84 =
  30. 30.Double 86 =
  31. 31.Half of 182 =
  32. 32.Double 72 =
  33. 33.Half of 194 =
  34. 34.Double 96 =
  35. 35.Half of 38 =
  36. 36.Double 24 =
  37. 37.Half of 188 =
  38. 38.Double 83 =
  39. 39.Double 47 =
  40. 40.Half of 192 =

Answer key

  1. 102
  2. 49
  3. 29
  4. 136
  5. 112
  6. 80
  7. 84
  8. 72
  9. 174
  10. 53
  11. 156
  12. 65
  13. 21
  14. 52
  15. 62
  16. 128
  17. 62
  18. 35
  19. 13
  20. 82
  21. 132
  22. 50
  23. 68
  24. 114
  25. 122
  26. 110
  27. 68
  28. 88
  29. 168
  30. 172
  31. 91
  32. 144
  33. 97
  34. 192
  35. 19
  36. 48
  37. 94
  38. 166
  39. 94
  40. 96

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