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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 214 · 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 172 =
  2. 2.Half of 58 =
  3. 3.Half of 40 =
  4. 4.Double 33 =
  5. 5.Half of 48 =
  6. 6.Double 55 =
  7. 7.Double 19 =
  8. 8.Half of 168 =
  9. 9.Half of 30 =
  10. 10.Double 34 =
  11. 11.Half of 46 =
  12. 12.Double 82 =
  13. 13.Double 76 =
  14. 14.Double 56 =
  15. 15.Double 73 =
  16. 16.Double 91 =
  17. 17.Double 21 =
  18. 18.Half of 122 =
  19. 19.Double 81 =
  20. 20.Half of 36 =
  21. 21.Double 63 =
  22. 22.Double 57 =
  23. 23.Double 48 =
  24. 24.Half of 68 =
  25. 25.Double 16 =
  26. 26.Double 97 =
  27. 27.Half of 62 =
  28. 28.Double 49 =
  29. 29.Double 37 =
  30. 30.Double 26 =
  31. 31.Double 41 =
  32. 32.Double 24 =
  33. 33.Half of 150 =
  34. 34.Double 86 =
  35. 35.Double 68 =
  36. 36.Double 17 =
  37. 37.Half of 52 =
  38. 38.Double 71 =
  39. 39.Half of 126 =
  40. 40.Half of 140 =

Answer key

  1. 86
  2. 29
  3. 20
  4. 66
  5. 24
  6. 110
  7. 38
  8. 84
  9. 15
  10. 68
  11. 23
  12. 164
  13. 152
  14. 112
  15. 146
  16. 182
  17. 42
  18. 61
  19. 162
  20. 18
  21. 126
  22. 114
  23. 96
  24. 34
  25. 32
  26. 194
  27. 31
  28. 98
  29. 74
  30. 52
  31. 82
  32. 48
  33. 75
  34. 172
  35. 136
  36. 34
  37. 26
  38. 142
  39. 63
  40. 70

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