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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 462 · 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 59 =
  2. 2.Half of 196 =
  3. 3.Double 75 =
  4. 4.Double 99 =
  5. 5.Double 84 =
  6. 6.Double 31 =
  7. 7.Half of 82 =
  8. 8.Half of 40 =
  9. 9.Double 54 =
  10. 10.Double 45 =
  11. 11.Half of 136 =
  12. 12.Double 53 =
  13. 13.Half of 190 =
  14. 14.Half of 74 =
  15. 15.Half of 58 =
  16. 16.Double 41 =
  17. 17.Half of 26 =
  18. 18.Double 51 =
  19. 19.Half of 118 =
  20. 20.Half of 88 =
  21. 21.Double 42 =
  22. 22.Half of 48 =
  23. 23.Double 96 =
  24. 24.Double 67 =
  25. 25.Double 16 =
  26. 26.Half of 60 =
  27. 27.Double 17 =
  28. 28.Double 66 =
  29. 29.Half of 86 =
  30. 30.Half of 44 =
  31. 31.Double 65 =
  32. 32.Double 61 =
  33. 33.Double 62 =
  34. 34.Half of 142 =
  35. 35.Half of 158 =
  36. 36.Half of 174 =
  37. 37.Double 72 =
  38. 38.Double 29 =
  39. 39.Double 89 =
  40. 40.Double 68 =

Answer key

  1. 118
  2. 98
  3. 150
  4. 198
  5. 168
  6. 62
  7. 41
  8. 20
  9. 108
  10. 90
  11. 68
  12. 106
  13. 95
  14. 37
  15. 29
  16. 82
  17. 13
  18. 102
  19. 59
  20. 44
  21. 84
  22. 24
  23. 192
  24. 134
  25. 32
  26. 30
  27. 34
  28. 132
  29. 43
  30. 22
  31. 130
  32. 122
  33. 124
  34. 71
  35. 79
  36. 87
  37. 144
  38. 58
  39. 178
  40. 136

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