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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 602 · 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 45 =
  2. 2.Half of 94 =
  3. 3.Double 36 =
  4. 4.Double 25 =
  5. 5.Half of 50 =
  6. 6.Half of 116 =
  7. 7.Double 96 =
  8. 8.Double 41 =
  9. 9.Half of 82 =
  10. 10.Half of 146 =
  11. 11.Half of 74 =
  12. 12.Half of 170 =
  13. 13.Double 27 =
  14. 14.Double 18 =
  15. 15.Double 63 =
  16. 16.Half of 198 =
  17. 17.Double 66 =
  18. 18.Double 78 =
  19. 19.Double 72 =
  20. 20.Double 26 =
  21. 21.Half of 176 =
  22. 22.Half of 58 =
  23. 23.Half of 174 =
  24. 24.Double 51 =
  25. 25.Double 53 =
  26. 26.Double 38 =
  27. 27.Half of 44 =
  28. 28.Half of 114 =
  29. 29.Half of 102 =
  30. 30.Double 82 =
  31. 31.Double 43 =
  32. 32.Half of 110 =
  33. 33.Double 97 =
  34. 34.Double 94 =
  35. 35.Double 19 =
  36. 36.Double 39 =
  37. 37.Double 49 =
  38. 38.Double 73 =
  39. 39.Double 76 =
  40. 40.Half of 80 =

Answer key

  1. 90
  2. 47
  3. 72
  4. 50
  5. 25
  6. 58
  7. 192
  8. 82
  9. 41
  10. 73
  11. 37
  12. 85
  13. 54
  14. 36
  15. 126
  16. 99
  17. 132
  18. 156
  19. 144
  20. 52
  21. 88
  22. 29
  23. 87
  24. 102
  25. 106
  26. 76
  27. 22
  28. 57
  29. 51
  30. 164
  31. 86
  32. 55
  33. 194
  34. 188
  35. 38
  36. 78
  37. 98
  38. 146
  39. 152
  40. 40

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