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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 484 · 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 77 =
  2. 2.Half of 106 =
  3. 3.Double 86 =
  4. 4.Double 81 =
  5. 5.Double 95 =
  6. 6.Double 66 =
  7. 7.Double 64 =
  8. 8.Half of 198 =
  9. 9.Double 22 =
  10. 10.Double 87 =
  11. 11.Double 28 =
  12. 12.Half of 28 =
  13. 13.Double 91 =
  14. 14.Half of 154 =
  15. 15.Half of 52 =
  16. 16.Half of 110 =
  17. 17.Half of 60 =
  18. 18.Double 73 =
  19. 19.Half of 152 =
  20. 20.Double 19 =
  21. 21.Half of 108 =
  22. 22.Half of 100 =
  23. 23.Half of 150 =
  24. 24.Double 62 =
  25. 25.Double 33 =
  26. 26.Double 48 =
  27. 27.Double 42 =
  28. 28.Half of 130 =
  29. 29.Double 32 =
  30. 30.Double 34 =
  31. 31.Half of 126 =
  32. 32.Half of 144 =
  33. 33.Half of 54 =
  34. 34.Double 69 =
  35. 35.Double 26 =
  36. 36.Half of 118 =
  37. 37.Half of 92 =
  38. 38.Double 25 =
  39. 39.Half of 96 =
  40. 40.Half of 50 =

Answer key

  1. 154
  2. 53
  3. 172
  4. 162
  5. 190
  6. 132
  7. 128
  8. 99
  9. 44
  10. 174
  11. 56
  12. 14
  13. 182
  14. 77
  15. 26
  16. 55
  17. 30
  18. 146
  19. 76
  20. 38
  21. 54
  22. 50
  23. 75
  24. 124
  25. 66
  26. 96
  27. 84
  28. 65
  29. 64
  30. 68
  31. 63
  32. 72
  33. 27
  34. 138
  35. 52
  36. 59
  37. 46
  38. 50
  39. 48
  40. 25

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