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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 357 · 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 97 =
  2. 2.Half of 54 =
  3. 3.Half of 86 =
  4. 4.Double 47 =
  5. 5.Half of 62 =
  6. 6.Double 52 =
  7. 7.Double 72 =
  8. 8.Double 55 =
  9. 9.Double 31 =
  10. 10.Double 25 =
  11. 11.Half of 188 =
  12. 12.Half of 158 =
  13. 13.Double 21 =
  14. 14.Double 57 =
  15. 15.Double 17 =
  16. 16.Half of 184 =
  17. 17.Double 89 =
  18. 18.Half of 176 =
  19. 19.Double 71 =
  20. 20.Half of 130 =
  21. 21.Half of 90 =
  22. 22.Half of 80 =
  23. 23.Half of 100 =
  24. 24.Double 41 =
  25. 25.Double 99 =
  26. 26.Half of 82 =
  27. 27.Half of 162 =
  28. 28.Half of 72 =
  29. 29.Double 42 =
  30. 30.Double 91 =
  31. 31.Double 27 =
  32. 32.Double 79 =
  33. 33.Half of 148 =
  34. 34.Double 86 =
  35. 35.Half of 30 =
  36. 36.Double 58 =
  37. 37.Half of 154 =
  38. 38.Half of 76 =
  39. 39.Double 94 =
  40. 40.Half of 150 =

Answer key

  1. 194
  2. 27
  3. 43
  4. 94
  5. 31
  6. 104
  7. 144
  8. 110
  9. 62
  10. 50
  11. 94
  12. 79
  13. 42
  14. 114
  15. 34
  16. 92
  17. 178
  18. 88
  19. 142
  20. 65
  21. 45
  22. 40
  23. 50
  24. 82
  25. 198
  26. 41
  27. 81
  28. 36
  29. 84
  30. 182
  31. 54
  32. 158
  33. 74
  34. 172
  35. 15
  36. 116
  37. 77
  38. 38
  39. 188
  40. 75

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