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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 134 · 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 162 =
  2. 2.Double 32 =
  3. 3.Half of 192 =
  4. 4.Double 34 =
  5. 5.Double 31 =
  6. 6.Half of 148 =
  7. 7.Half of 60 =
  8. 8.Double 46 =
  9. 9.Double 79 =
  10. 10.Half of 96 =
  11. 11.Double 63 =
  12. 12.Half of 146 =
  13. 13.Double 62 =
  14. 14.Double 39 =
  15. 15.Double 73 =
  16. 16.Half of 116 =
  17. 17.Half of 156 =
  18. 18.Half of 92 =
  19. 19.Half of 172 =
  20. 20.Half of 170 =
  21. 21.Half of 108 =
  22. 22.Double 98 =
  23. 23.Double 93 =
  24. 24.Half of 70 =
  25. 25.Half of 124 =
  26. 26.Half of 38 =
  27. 27.Half of 90 =
  28. 28.Double 51 =
  29. 29.Double 67 =
  30. 30.Double 22 =
  31. 31.Double 82 =
  32. 32.Double 24 =
  33. 33.Half of 80 =
  34. 34.Half of 94 =
  35. 35.Double 38 =
  36. 36.Double 54 =
  37. 37.Double 26 =
  38. 38.Half of 88 =
  39. 39.Half of 98 =
  40. 40.Double 64 =

Answer key

  1. 81
  2. 64
  3. 96
  4. 68
  5. 62
  6. 74
  7. 30
  8. 92
  9. 158
  10. 48
  11. 126
  12. 73
  13. 124
  14. 78
  15. 146
  16. 58
  17. 78
  18. 46
  19. 86
  20. 85
  21. 54
  22. 196
  23. 186
  24. 35
  25. 62
  26. 19
  27. 45
  28. 102
  29. 134
  30. 44
  31. 164
  32. 48
  33. 40
  34. 47
  35. 76
  36. 108
  37. 52
  38. 44
  39. 49
  40. 128

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