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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 493 · 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 47 =
  2. 2.Half of 116 =
  3. 3.Half of 84 =
  4. 4.Half of 26 =
  5. 5.Double 34 =
  6. 6.Double 53 =
  7. 7.Double 94 =
  8. 8.Double 41 =
  9. 9.Half of 192 =
  10. 10.Half of 98 =
  11. 11.Double 75 =
  12. 12.Half of 44 =
  13. 13.Half of 40 =
  14. 14.Double 84 =
  15. 15.Double 81 =
  16. 16.Double 89 =
  17. 17.Double 35 =
  18. 18.Half of 30 =
  19. 19.Double 21 =
  20. 20.Half of 88 =
  21. 21.Double 54 =
  22. 22.Double 62 =
  23. 23.Double 31 =
  24. 24.Double 83 =
  25. 25.Double 97 =
  26. 26.Double 93 =
  27. 27.Double 72 =
  28. 28.Half of 184 =
  29. 29.Half of 190 =
  30. 30.Double 86 =
  31. 31.Double 59 =
  32. 32.Double 61 =
  33. 33.Double 51 =
  34. 34.Half of 36 =
  35. 35.Half of 54 =
  36. 36.Double 39 =
  37. 37.Half of 138 =
  38. 38.Half of 80 =
  39. 39.Double 23 =
  40. 40.Double 52 =

Answer key

  1. 94
  2. 58
  3. 42
  4. 13
  5. 68
  6. 106
  7. 188
  8. 82
  9. 96
  10. 49
  11. 150
  12. 22
  13. 20
  14. 168
  15. 162
  16. 178
  17. 70
  18. 15
  19. 42
  20. 44
  21. 108
  22. 124
  23. 62
  24. 166
  25. 194
  26. 186
  27. 144
  28. 92
  29. 95
  30. 172
  31. 118
  32. 122
  33. 102
  34. 18
  35. 27
  36. 78
  37. 69
  38. 40
  39. 46
  40. 104

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