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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 355 · 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 154 =
  2. 2.Half of 142 =
  3. 3.Double 74 =
  4. 4.Double 18 =
  5. 5.Double 56 =
  6. 6.Half of 102 =
  7. 7.Double 32 =
  8. 8.Double 33 =
  9. 9.Double 69 =
  10. 10.Double 44 =
  11. 11.Half of 68 =
  12. 12.Double 99 =
  13. 13.Half of 106 =
  14. 14.Double 86 =
  15. 15.Double 62 =
  16. 16.Half of 86 =
  17. 17.Double 84 =
  18. 18.Double 76 =
  19. 19.Double 65 =
  20. 20.Half of 194 =
  21. 21.Half of 70 =
  22. 22.Double 21 =
  23. 23.Double 61 =
  24. 24.Double 88 =
  25. 25.Double 83 =
  26. 26.Half of 72 =
  27. 27.Double 85 =
  28. 28.Half of 62 =
  29. 29.Half of 118 =
  30. 30.Half of 46 =
  31. 31.Half of 180 =
  32. 32.Double 81 =
  33. 33.Half of 76 =
  34. 34.Half of 160 =
  35. 35.Half of 90 =
  36. 36.Half of 132 =
  37. 37.Double 96 =
  38. 38.Half of 122 =
  39. 39.Double 26 =
  40. 40.Half of 104 =

Answer key

  1. 77
  2. 71
  3. 148
  4. 36
  5. 112
  6. 51
  7. 64
  8. 66
  9. 138
  10. 88
  11. 34
  12. 198
  13. 53
  14. 172
  15. 124
  16. 43
  17. 168
  18. 152
  19. 130
  20. 97
  21. 35
  22. 42
  23. 122
  24. 176
  25. 166
  26. 36
  27. 170
  28. 31
  29. 59
  30. 23
  31. 90
  32. 162
  33. 38
  34. 80
  35. 45
  36. 66
  37. 192
  38. 61
  39. 52
  40. 52

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