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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 245 · 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 122 =
  2. 2.Double 81 =
  3. 3.Double 71 =
  4. 4.Half of 58 =
  5. 5.Half of 168 =
  6. 6.Double 93 =
  7. 7.Half of 76 =
  8. 8.Double 87 =
  9. 9.Double 57 =
  10. 10.Half of 152 =
  11. 11.Double 51 =
  12. 12.Double 55 =
  13. 13.Half of 118 =
  14. 14.Double 65 =
  15. 15.Double 63 =
  16. 16.Half of 150 =
  17. 17.Half of 88 =
  18. 18.Half of 198 =
  19. 19.Double 39 =
  20. 20.Half of 136 =
  21. 21.Double 18 =
  22. 22.Double 16 =
  23. 23.Double 34 =
  24. 24.Double 92 =
  25. 25.Double 61 =
  26. 26.Half of 90 =
  27. 27.Double 56 =
  28. 28.Half of 28 =
  29. 29.Double 53 =
  30. 30.Half of 180 =
  31. 31.Double 62 =
  32. 32.Double 47 =
  33. 33.Half of 172 =
  34. 34.Double 21 =
  35. 35.Half of 92 =
  36. 36.Half of 26 =
  37. 37.Half of 146 =
  38. 38.Double 37 =
  39. 39.Double 89 =
  40. 40.Half of 54 =

Answer key

  1. 61
  2. 162
  3. 142
  4. 29
  5. 84
  6. 186
  7. 38
  8. 174
  9. 114
  10. 76
  11. 102
  12. 110
  13. 59
  14. 130
  15. 126
  16. 75
  17. 44
  18. 99
  19. 78
  20. 68
  21. 36
  22. 32
  23. 68
  24. 184
  25. 122
  26. 45
  27. 112
  28. 14
  29. 106
  30. 90
  31. 124
  32. 94
  33. 86
  34. 42
  35. 46
  36. 13
  37. 73
  38. 74
  39. 178
  40. 27

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