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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 120 · 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 52 =
  2. 2.Double 57 =
  3. 3.Half of 198 =
  4. 4.Half of 56 =
  5. 5.Double 82 =
  6. 6.Half of 80 =
  7. 7.Double 94 =
  8. 8.Half of 136 =
  9. 9.Half of 148 =
  10. 10.Half of 46 =
  11. 11.Half of 38 =
  12. 12.Half of 104 =
  13. 13.Double 31 =
  14. 14.Half of 182 =
  15. 15.Double 23 =
  16. 16.Half of 88 =
  17. 17.Half of 150 =
  18. 18.Double 64 =
  19. 19.Half of 86 =
  20. 20.Half of 194 =
  21. 21.Double 32 =
  22. 22.Double 95 =
  23. 23.Double 46 =
  24. 24.Double 36 =
  25. 25.Double 51 =
  26. 26.Double 42 =
  27. 27.Half of 170 =
  28. 28.Half of 44 =
  29. 29.Half of 144 =
  30. 30.Half of 186 =
  31. 31.Double 43 =
  32. 32.Double 21 =
  33. 33.Double 27 =
  34. 34.Double 72 =
  35. 35.Half of 164 =
  36. 36.Half of 158 =
  37. 37.Double 77 =
  38. 38.Half of 34 =
  39. 39.Double 34 =
  40. 40.Half of 62 =

Answer key

  1. 26
  2. 114
  3. 99
  4. 28
  5. 164
  6. 40
  7. 188
  8. 68
  9. 74
  10. 23
  11. 19
  12. 52
  13. 62
  14. 91
  15. 46
  16. 44
  17. 75
  18. 128
  19. 43
  20. 97
  21. 64
  22. 190
  23. 92
  24. 72
  25. 102
  26. 84
  27. 85
  28. 22
  29. 72
  30. 93
  31. 86
  32. 42
  33. 54
  34. 144
  35. 82
  36. 79
  37. 154
  38. 17
  39. 68
  40. 31

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