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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 414 · 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 66 =
  2. 2.Double 26 =
  3. 3.Double 17 =
  4. 4.Double 67 =
  5. 5.Double 69 =
  6. 6.Half of 172 =
  7. 7.Double 44 =
  8. 8.Half of 130 =
  9. 9.Double 39 =
  10. 10.Double 57 =
  11. 11.Half of 48 =
  12. 12.Double 86 =
  13. 13.Half of 138 =
  14. 14.Double 32 =
  15. 15.Double 61 =
  16. 16.Double 31 =
  17. 17.Half of 102 =
  18. 18.Double 81 =
  19. 19.Half of 36 =
  20. 20.Double 37 =
  21. 21.Double 91 =
  22. 22.Half of 80 =
  23. 23.Half of 190 =
  24. 24.Half of 34 =
  25. 25.Double 46 =
  26. 26.Half of 122 =
  27. 27.Half of 62 =
  28. 28.Half of 110 =
  29. 29.Double 56 =
  30. 30.Double 49 =
  31. 31.Half of 54 =
  32. 32.Double 62 =
  33. 33.Half of 186 =
  34. 34.Half of 50 =
  35. 35.Double 84 =
  36. 36.Half of 30 =
  37. 37.Half of 26 =
  38. 38.Half of 72 =
  39. 39.Half of 114 =
  40. 40.Double 96 =

Answer key

  1. 132
  2. 52
  3. 34
  4. 134
  5. 138
  6. 86
  7. 88
  8. 65
  9. 78
  10. 114
  11. 24
  12. 172
  13. 69
  14. 64
  15. 122
  16. 62
  17. 51
  18. 162
  19. 18
  20. 74
  21. 182
  22. 40
  23. 95
  24. 17
  25. 92
  26. 61
  27. 31
  28. 55
  29. 112
  30. 98
  31. 27
  32. 124
  33. 93
  34. 25
  35. 168
  36. 15
  37. 13
  38. 36
  39. 57
  40. 192

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