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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 227 · 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 86 =
  2. 2.Half of 166 =
  3. 3.Half of 26 =
  4. 4.Half of 40 =
  5. 5.Half of 142 =
  6. 6.Half of 188 =
  7. 7.Double 81 =
  8. 8.Half of 56 =
  9. 9.Half of 44 =
  10. 10.Half of 112 =
  11. 11.Double 17 =
  12. 12.Double 33 =
  13. 13.Double 34 =
  14. 14.Double 18 =
  15. 15.Double 22 =
  16. 16.Double 87 =
  17. 17.Half of 180 =
  18. 18.Half of 184 =
  19. 19.Double 93 =
  20. 20.Half of 190 =
  21. 21.Half of 178 =
  22. 22.Double 24 =
  23. 23.Double 85 =
  24. 24.Double 84 =
  25. 25.Half of 156 =
  26. 26.Double 37 =
  27. 27.Half of 88 =
  28. 28.Double 61 =
  29. 29.Half of 146 =
  30. 30.Half of 150 =
  31. 31.Half of 182 =
  32. 32.Half of 140 =
  33. 33.Half of 118 =
  34. 34.Double 21 =
  35. 35.Double 23 =
  36. 36.Double 41 =
  37. 37.Double 59 =
  38. 38.Half of 172 =
  39. 39.Double 71 =
  40. 40.Half of 158 =

Answer key

  1. 172
  2. 83
  3. 13
  4. 20
  5. 71
  6. 94
  7. 162
  8. 28
  9. 22
  10. 56
  11. 34
  12. 66
  13. 68
  14. 36
  15. 44
  16. 174
  17. 90
  18. 92
  19. 186
  20. 95
  21. 89
  22. 48
  23. 170
  24. 168
  25. 78
  26. 74
  27. 44
  28. 122
  29. 73
  30. 75
  31. 91
  32. 70
  33. 59
  34. 42
  35. 46
  36. 82
  37. 118
  38. 86
  39. 142
  40. 79

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