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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 47 · 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 60 =
  2. 2.Half of 96 =
  3. 3.Double 72 =
  4. 4.Half of 184 =
  5. 5.Half of 40 =
  6. 6.Double 74 =
  7. 7.Double 95 =
  8. 8.Half of 72 =
  9. 9.Double 81 =
  10. 10.Double 47 =
  11. 11.Double 44 =
  12. 12.Double 76 =
  13. 13.Half of 100 =
  14. 14.Double 16 =
  15. 15.Half of 182 =
  16. 16.Double 61 =
  17. 17.Double 97 =
  18. 18.Double 71 =
  19. 19.Half of 162 =
  20. 20.Half of 62 =
  21. 21.Double 98 =
  22. 22.Double 28 =
  23. 23.Half of 154 =
  24. 24.Half of 32 =
  25. 25.Half of 58 =
  26. 26.Double 59 =
  27. 27.Half of 26 =
  28. 28.Double 31 =
  29. 29.Half of 180 =
  30. 30.Double 52 =
  31. 31.Double 88 =
  32. 32.Half of 194 =
  33. 33.Double 35 =
  34. 34.Double 82 =
  35. 35.Double 43 =
  36. 36.Double 86 =
  37. 37.Half of 34 =
  38. 38.Half of 158 =
  39. 39.Half of 112 =
  40. 40.Half of 68 =

Answer key

  1. 30
  2. 48
  3. 144
  4. 92
  5. 20
  6. 148
  7. 190
  8. 36
  9. 162
  10. 94
  11. 88
  12. 152
  13. 50
  14. 32
  15. 91
  16. 122
  17. 194
  18. 142
  19. 81
  20. 31
  21. 196
  22. 56
  23. 77
  24. 16
  25. 29
  26. 118
  27. 13
  28. 62
  29. 90
  30. 104
  31. 176
  32. 97
  33. 70
  34. 164
  35. 86
  36. 172
  37. 17
  38. 79
  39. 56
  40. 34

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