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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 253 · 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 78 =
  2. 2.Double 39 =
  3. 3.Half of 180 =
  4. 4.Half of 168 =
  5. 5.Half of 174 =
  6. 6.Double 64 =
  7. 7.Double 79 =
  8. 8.Double 84 =
  9. 9.Double 46 =
  10. 10.Double 91 =
  11. 11.Double 27 =
  12. 12.Double 61 =
  13. 13.Double 97 =
  14. 14.Double 54 =
  15. 15.Half of 160 =
  16. 16.Half of 118 =
  17. 17.Double 51 =
  18. 18.Half of 166 =
  19. 19.Half of 80 =
  20. 20.Half of 52 =
  21. 21.Double 53 =
  22. 22.Half of 172 =
  23. 23.Double 31 =
  24. 24.Double 93 =
  25. 25.Double 38 =
  26. 26.Half of 150 =
  27. 27.Half of 30 =
  28. 28.Half of 178 =
  29. 29.Half of 136 =
  30. 30.Half of 94 =
  31. 31.Half of 48 =
  32. 32.Double 18 =
  33. 33.Half of 122 =
  34. 34.Half of 26 =
  35. 35.Half of 84 =
  36. 36.Double 52 =
  37. 37.Half of 74 =
  38. 38.Half of 128 =
  39. 39.Half of 156 =
  40. 40.Double 94 =

Answer key

  1. 39
  2. 78
  3. 90
  4. 84
  5. 87
  6. 128
  7. 158
  8. 168
  9. 92
  10. 182
  11. 54
  12. 122
  13. 194
  14. 108
  15. 80
  16. 59
  17. 102
  18. 83
  19. 40
  20. 26
  21. 106
  22. 86
  23. 62
  24. 186
  25. 76
  26. 75
  27. 15
  28. 89
  29. 68
  30. 47
  31. 24
  32. 36
  33. 61
  34. 13
  35. 42
  36. 104
  37. 37
  38. 64
  39. 78
  40. 188

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