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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 517 · 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 58 =
  2. 2.Half of 192 =
  3. 3.Half of 142 =
  4. 4.Double 52 =
  5. 5.Half of 74 =
  6. 6.Half of 70 =
  7. 7.Double 71 =
  8. 8.Double 93 =
  9. 9.Half of 36 =
  10. 10.Half of 154 =
  11. 11.Half of 86 =
  12. 12.Double 97 =
  13. 13.Half of 98 =
  14. 14.Half of 48 =
  15. 15.Double 26 =
  16. 16.Half of 186 =
  17. 17.Half of 172 =
  18. 18.Half of 162 =
  19. 19.Half of 118 =
  20. 20.Double 38 =
  21. 21.Half of 106 =
  22. 22.Double 51 =
  23. 23.Half of 26 =
  24. 24.Double 53 =
  25. 25.Half of 62 =
  26. 26.Double 55 =
  27. 27.Half of 96 =
  28. 28.Half of 60 =
  29. 29.Double 63 =
  30. 30.Double 54 =
  31. 31.Half of 66 =
  32. 32.Double 45 =
  33. 33.Half of 42 =
  34. 34.Half of 128 =
  35. 35.Half of 126 =
  36. 36.Double 88 =
  37. 37.Half of 40 =
  38. 38.Double 94 =
  39. 39.Double 62 =
  40. 40.Double 41 =

Answer key

  1. 116
  2. 96
  3. 71
  4. 104
  5. 37
  6. 35
  7. 142
  8. 186
  9. 18
  10. 77
  11. 43
  12. 194
  13. 49
  14. 24
  15. 52
  16. 93
  17. 86
  18. 81
  19. 59
  20. 76
  21. 53
  22. 102
  23. 13
  24. 106
  25. 31
  26. 110
  27. 48
  28. 30
  29. 126
  30. 108
  31. 33
  32. 90
  33. 21
  34. 64
  35. 63
  36. 176
  37. 20
  38. 188
  39. 124
  40. 82

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