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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 59 · 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 44 =
  3. 3.Double 39 =
  4. 4.Double 81 =
  5. 5.Half of 72 =
  6. 6.Half of 120 =
  7. 7.Double 88 =
  8. 8.Half of 40 =
  9. 9.Double 42 =
  10. 10.Half of 112 =
  11. 11.Half of 194 =
  12. 12.Double 84 =
  13. 13.Half of 186 =
  14. 14.Double 23 =
  15. 15.Double 32 =
  16. 16.Half of 176 =
  17. 17.Half of 144 =
  18. 18.Double 95 =
  19. 19.Double 55 =
  20. 20.Half of 90 =
  21. 21.Double 29 =
  22. 22.Half of 78 =
  23. 23.Half of 138 =
  24. 24.Half of 174 =
  25. 25.Double 53 =
  26. 26.Half of 70 =
  27. 27.Half of 162 =
  28. 28.Half of 36 =
  29. 29.Half of 184 =
  30. 30.Double 31 =
  31. 31.Double 63 =
  32. 32.Half of 58 =
  33. 33.Half of 196 =
  34. 34.Double 43 =
  35. 35.Half of 80 =
  36. 36.Half of 172 =
  37. 37.Half of 96 =
  38. 38.Double 75 =
  39. 39.Double 78 =
  40. 40.Double 65 =

Answer key

  1. 194
  2. 22
  3. 78
  4. 162
  5. 36
  6. 60
  7. 176
  8. 20
  9. 84
  10. 56
  11. 97
  12. 168
  13. 93
  14. 46
  15. 64
  16. 88
  17. 72
  18. 190
  19. 110
  20. 45
  21. 58
  22. 39
  23. 69
  24. 87
  25. 106
  26. 35
  27. 81
  28. 18
  29. 92
  30. 62
  31. 126
  32. 29
  33. 98
  34. 86
  35. 40
  36. 86
  37. 48
  38. 150
  39. 156
  40. 130

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