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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 68 · 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 33 =
  2. 2.Half of 126 =
  3. 3.Half of 122 =
  4. 4.Double 36 =
  5. 5.Double 26 =
  6. 6.Double 65 =
  7. 7.Half of 166 =
  8. 8.Double 88 =
  9. 9.Double 82 =
  10. 10.Double 63 =
  11. 11.Half of 102 =
  12. 12.Half of 198 =
  13. 13.Half of 70 =
  14. 14.Double 86 =
  15. 15.Double 37 =
  16. 16.Half of 86 =
  17. 17.Half of 174 =
  18. 18.Double 96 =
  19. 19.Half of 172 =
  20. 20.Half of 50 =
  21. 21.Half of 140 =
  22. 22.Double 45 =
  23. 23.Double 55 =
  24. 24.Half of 96 =
  25. 25.Double 81 =
  26. 26.Half of 178 =
  27. 27.Double 57 =
  28. 28.Half of 72 =
  29. 29.Double 77 =
  30. 30.Half of 40 =
  31. 31.Half of 110 =
  32. 32.Double 21 =
  33. 33.Half of 66 =
  34. 34.Double 51 =
  35. 35.Half of 124 =
  36. 36.Double 85 =
  37. 37.Half of 164 =
  38. 38.Double 66 =
  39. 39.Double 35 =
  40. 40.Double 31 =

Answer key

  1. 66
  2. 63
  3. 61
  4. 72
  5. 52
  6. 130
  7. 83
  8. 176
  9. 164
  10. 126
  11. 51
  12. 99
  13. 35
  14. 172
  15. 74
  16. 43
  17. 87
  18. 192
  19. 86
  20. 25
  21. 70
  22. 90
  23. 110
  24. 48
  25. 162
  26. 89
  27. 114
  28. 36
  29. 154
  30. 20
  31. 55
  32. 42
  33. 33
  34. 102
  35. 62
  36. 170
  37. 82
  38. 132
  39. 70
  40. 62

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