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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 633 · 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 17 =
  2. 2.Half of 196 =
  3. 3.Double 79 =
  4. 4.Double 89 =
  5. 5.Half of 138 =
  6. 6.Double 52 =
  7. 7.Half of 104 =
  8. 8.Half of 182 =
  9. 9.Double 76 =
  10. 10.Half of 50 =
  11. 11.Half of 66 =
  12. 12.Double 63 =
  13. 13.Half of 48 =
  14. 14.Half of 158 =
  15. 15.Half of 42 =
  16. 16.Double 62 =
  17. 17.Half of 102 =
  18. 18.Double 88 =
  19. 19.Half of 78 =
  20. 20.Double 27 =
  21. 21.Half of 116 =
  22. 22.Half of 122 =
  23. 23.Half of 108 =
  24. 24.Half of 126 =
  25. 25.Half of 44 =
  26. 26.Double 32 =
  27. 27.Double 29 =
  28. 28.Double 28 =
  29. 29.Double 26 =
  30. 30.Double 82 =
  31. 31.Half of 176 =
  32. 32.Half of 56 =
  33. 33.Double 46 =
  34. 34.Half of 166 =
  35. 35.Half of 86 =
  36. 36.Double 81 =
  37. 37.Half of 162 =
  38. 38.Double 93 =
  39. 39.Half of 190 =
  40. 40.Half of 60 =

Answer key

  1. 34
  2. 98
  3. 158
  4. 178
  5. 69
  6. 104
  7. 52
  8. 91
  9. 152
  10. 25
  11. 33
  12. 126
  13. 24
  14. 79
  15. 21
  16. 124
  17. 51
  18. 176
  19. 39
  20. 54
  21. 58
  22. 61
  23. 54
  24. 63
  25. 22
  26. 64
  27. 58
  28. 56
  29. 52
  30. 164
  31. 88
  32. 28
  33. 92
  34. 83
  35. 43
  36. 162
  37. 81
  38. 186
  39. 95
  40. 30

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