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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 201 · 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.Double 71 =
  3. 3.Double 31 =
  4. 4.Double 43 =
  5. 5.Half of 180 =
  6. 6.Double 69 =
  7. 7.Half of 72 =
  8. 8.Half of 70 =
  9. 9.Half of 52 =
  10. 10.Double 18 =
  11. 11.Double 93 =
  12. 12.Half of 114 =
  13. 13.Half of 30 =
  14. 14.Half of 32 =
  15. 15.Half of 140 =
  16. 16.Double 48 =
  17. 17.Double 56 =
  18. 18.Double 44 =
  19. 19.Half of 162 =
  20. 20.Half of 112 =
  21. 21.Double 62 =
  22. 22.Double 59 =
  23. 23.Half of 160 =
  24. 24.Double 55 =
  25. 25.Half of 78 =
  26. 26.Double 21 =
  27. 27.Double 23 =
  28. 28.Half of 42 =
  29. 29.Half of 146 =
  30. 30.Half of 82 =
  31. 31.Double 54 =
  32. 32.Half of 76 =
  33. 33.Double 29 =
  34. 34.Double 49 =
  35. 35.Half of 198 =
  36. 36.Double 88 =
  37. 37.Half of 102 =
  38. 38.Half of 178 =
  39. 39.Half of 66 =
  40. 40.Double 76 =

Answer key

  1. 172
  2. 142
  3. 62
  4. 86
  5. 90
  6. 138
  7. 36
  8. 35
  9. 26
  10. 36
  11. 186
  12. 57
  13. 15
  14. 16
  15. 70
  16. 96
  17. 112
  18. 88
  19. 81
  20. 56
  21. 124
  22. 118
  23. 80
  24. 110
  25. 39
  26. 42
  27. 46
  28. 21
  29. 73
  30. 41
  31. 108
  32. 38
  33. 58
  34. 98
  35. 99
  36. 176
  37. 51
  38. 89
  39. 33
  40. 152

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