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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 710 · 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 114 =
  2. 2.Half of 72 =
  3. 3.Half of 124 =
  4. 4.Half of 40 =
  5. 5.Double 21 =
  6. 6.Half of 102 =
  7. 7.Double 76 =
  8. 8.Double 18 =
  9. 9.Half of 38 =
  10. 10.Half of 180 =
  11. 11.Double 52 =
  12. 12.Half of 194 =
  13. 13.Half of 84 =
  14. 14.Double 16 =
  15. 15.Double 87 =
  16. 16.Double 91 =
  17. 17.Double 89 =
  18. 18.Double 81 =
  19. 19.Half of 92 =
  20. 20.Half of 82 =
  21. 21.Double 96 =
  22. 22.Double 66 =
  23. 23.Double 37 =
  24. 24.Half of 188 =
  25. 25.Double 85 =
  26. 26.Half of 36 =
  27. 27.Half of 100 =
  28. 28.Half of 126 =
  29. 29.Half of 76 =
  30. 30.Double 35 =
  31. 31.Half of 182 =
  32. 32.Half of 122 =
  33. 33.Double 39 =
  34. 34.Half of 110 =
  35. 35.Double 56 =
  36. 36.Half of 26 =
  37. 37.Half of 94 =
  38. 38.Half of 190 =
  39. 39.Half of 44 =
  40. 40.Half of 136 =

Answer key

  1. 57
  2. 36
  3. 62
  4. 20
  5. 42
  6. 51
  7. 152
  8. 36
  9. 19
  10. 90
  11. 104
  12. 97
  13. 42
  14. 32
  15. 174
  16. 182
  17. 178
  18. 162
  19. 46
  20. 41
  21. 192
  22. 132
  23. 74
  24. 94
  25. 170
  26. 18
  27. 50
  28. 63
  29. 38
  30. 70
  31. 91
  32. 61
  33. 78
  34. 55
  35. 112
  36. 13
  37. 47
  38. 95
  39. 22
  40. 68

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