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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 324 · 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.Half of 160 =
  2. 2.Double 89 =
  3. 3.Double 58 =
  4. 4.Half of 88 =
  5. 5.Double 73 =
  6. 6.Half of 146 =
  7. 7.Half of 78 =
  8. 8.Half of 30 =
  9. 9.Double 85 =
  10. 10.Half of 112 =
  11. 11.Double 87 =
  12. 12.Double 46 =
  13. 13.Double 31 =
  14. 14.Half of 108 =
  15. 15.Half of 72 =
  16. 16.Half of 86 =
  17. 17.Half of 120 =
  18. 18.Double 71 =
  19. 19.Half of 188 =
  20. 20.Double 47 =
  21. 21.Double 66 =
  22. 22.Half of 196 =
  23. 23.Half of 170 =
  24. 24.Double 62 =
  25. 25.Half of 40 =
  26. 26.Double 69 =
  27. 27.Half of 50 =
  28. 28.Double 91 =
  29. 29.Double 17 =
  30. 30.Half of 36 =
  31. 31.Half of 80 =
  32. 32.Double 24 =
  33. 33.Double 65 =
  34. 34.Half of 194 =
  35. 35.Half of 64 =
  36. 36.Half of 56 =
  37. 37.Double 51 =
  38. 38.Half of 144 =
  39. 39.Half of 184 =
  40. 40.Half of 182 =

Answer key

  1. 80
  2. 178
  3. 116
  4. 44
  5. 146
  6. 73
  7. 39
  8. 15
  9. 170
  10. 56
  11. 174
  12. 92
  13. 62
  14. 54
  15. 36
  16. 43
  17. 60
  18. 142
  19. 94
  20. 94
  21. 132
  22. 98
  23. 85
  24. 124
  25. 20
  26. 138
  27. 25
  28. 182
  29. 34
  30. 18
  31. 40
  32. 48
  33. 130
  34. 97
  35. 32
  36. 28
  37. 102
  38. 72
  39. 92
  40. 91

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