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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 735 · 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 190 =
  2. 2.Half of 144 =
  3. 3.Double 43 =
  4. 4.Half of 38 =
  5. 5.Double 94 =
  6. 6.Double 29 =
  7. 7.Half of 194 =
  8. 8.Double 84 =
  9. 9.Double 51 =
  10. 10.Double 61 =
  11. 11.Half of 28 =
  12. 12.Half of 54 =
  13. 13.Double 34 =
  14. 14.Double 25 =
  15. 15.Double 41 =
  16. 16.Half of 148 =
  17. 17.Half of 40 =
  18. 18.Half of 162 =
  19. 19.Half of 118 =
  20. 20.Half of 36 =
  21. 21.Half of 48 =
  22. 22.Half of 64 =
  23. 23.Half of 72 =
  24. 24.Double 35 =
  25. 25.Double 17 =
  26. 26.Double 22 =
  27. 27.Double 45 =
  28. 28.Half of 34 =
  29. 29.Half of 92 =
  30. 30.Half of 58 =
  31. 31.Half of 188 =
  32. 32.Half of 44 =
  33. 33.Half of 26 =
  34. 34.Half of 178 =
  35. 35.Double 28 =
  36. 36.Double 98 =
  37. 37.Half of 132 =
  38. 38.Half of 136 =
  39. 39.Half of 106 =
  40. 40.Half of 166 =

Answer key

  1. 95
  2. 72
  3. 86
  4. 19
  5. 188
  6. 58
  7. 97
  8. 168
  9. 102
  10. 122
  11. 14
  12. 27
  13. 68
  14. 50
  15. 82
  16. 74
  17. 20
  18. 81
  19. 59
  20. 18
  21. 24
  22. 32
  23. 36
  24. 70
  25. 34
  26. 44
  27. 90
  28. 17
  29. 46
  30. 29
  31. 94
  32. 22
  33. 13
  34. 89
  35. 56
  36. 196
  37. 66
  38. 68
  39. 53
  40. 83

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