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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 490 · 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 72 =
  2. 2.Half of 168 =
  3. 3.Half of 106 =
  4. 4.Double 43 =
  5. 5.Double 93 =
  6. 6.Half of 76 =
  7. 7.Double 88 =
  8. 8.Double 32 =
  9. 9.Double 97 =
  10. 10.Double 61 =
  11. 11.Half of 118 =
  12. 12.Half of 86 =
  13. 13.Half of 50 =
  14. 14.Half of 82 =
  15. 15.Double 35 =
  16. 16.Half of 120 =
  17. 17.Double 89 =
  18. 18.Half of 162 =
  19. 19.Half of 52 =
  20. 20.Half of 32 =
  21. 21.Half of 170 =
  22. 22.Double 66 =
  23. 23.Double 69 =
  24. 24.Half of 62 =
  25. 25.Half of 188 =
  26. 26.Double 58 =
  27. 27.Double 73 =
  28. 28.Double 49 =
  29. 29.Half of 132 =
  30. 30.Double 47 =
  31. 31.Half of 36 =
  32. 32.Double 26 =
  33. 33.Half of 198 =
  34. 34.Double 91 =
  35. 35.Half of 42 =
  36. 36.Double 42 =
  37. 37.Double 23 =
  38. 38.Half of 182 =
  39. 39.Half of 144 =
  40. 40.Double 41 =

Answer key

  1. 36
  2. 84
  3. 53
  4. 86
  5. 186
  6. 38
  7. 176
  8. 64
  9. 194
  10. 122
  11. 59
  12. 43
  13. 25
  14. 41
  15. 70
  16. 60
  17. 178
  18. 81
  19. 26
  20. 16
  21. 85
  22. 132
  23. 138
  24. 31
  25. 94
  26. 116
  27. 146
  28. 98
  29. 66
  30. 94
  31. 18
  32. 52
  33. 99
  34. 182
  35. 21
  36. 84
  37. 46
  38. 91
  39. 72
  40. 82

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