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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 271 · 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 62 =
  2. 2.Double 99 =
  3. 3.Half of 104 =
  4. 4.Double 89 =
  5. 5.Half of 124 =
  6. 6.Half of 72 =
  7. 7.Half of 102 =
  8. 8.Half of 134 =
  9. 9.Half of 34 =
  10. 10.Half of 180 =
  11. 11.Half of 28 =
  12. 12.Half of 106 =
  13. 13.Double 24 =
  14. 14.Double 28 =
  15. 15.Half of 170 =
  16. 16.Double 84 =
  17. 17.Half of 152 =
  18. 18.Half of 88 =
  19. 19.Half of 36 =
  20. 20.Half of 190 =
  21. 21.Double 56 =
  22. 22.Half of 138 =
  23. 23.Half of 44 =
  24. 24.Double 57 =
  25. 25.Double 55 =
  26. 26.Double 67 =
  27. 27.Double 43 =
  28. 28.Double 37 =
  29. 29.Double 47 =
  30. 30.Half of 120 =
  31. 31.Half of 160 =
  32. 32.Double 63 =
  33. 33.Double 79 =
  34. 34.Half of 144 =
  35. 35.Double 59 =
  36. 36.Half of 168 =
  37. 37.Double 25 =
  38. 38.Half of 60 =
  39. 39.Half of 162 =
  40. 40.Double 36 =

Answer key

  1. 124
  2. 198
  3. 52
  4. 178
  5. 62
  6. 36
  7. 51
  8. 67
  9. 17
  10. 90
  11. 14
  12. 53
  13. 48
  14. 56
  15. 85
  16. 168
  17. 76
  18. 44
  19. 18
  20. 95
  21. 112
  22. 69
  23. 22
  24. 114
  25. 110
  26. 134
  27. 86
  28. 74
  29. 94
  30. 60
  31. 80
  32. 126
  33. 158
  34. 72
  35. 118
  36. 84
  37. 50
  38. 30
  39. 81
  40. 72

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