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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 711 · 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 122 =
  2. 2.Double 36 =
  3. 3.Double 24 =
  4. 4.Half of 48 =
  5. 5.Double 16 =
  6. 6.Half of 162 =
  7. 7.Double 52 =
  8. 8.Double 25 =
  9. 9.Double 94 =
  10. 10.Half of 84 =
  11. 11.Half of 80 =
  12. 12.Half of 124 =
  13. 13.Double 51 =
  14. 14.Double 78 =
  15. 15.Double 28 =
  16. 16.Half of 64 =
  17. 17.Half of 66 =
  18. 18.Double 66 =
  19. 19.Double 74 =
  20. 20.Half of 198 =
  21. 21.Double 29 =
  22. 22.Half of 86 =
  23. 23.Half of 36 =
  24. 24.Half of 88 =
  25. 25.Double 54 =
  26. 26.Half of 126 =
  27. 27.Half of 106 =
  28. 28.Half of 118 =
  29. 29.Double 97 =
  30. 30.Half of 28 =
  31. 31.Double 35 =
  32. 32.Double 42 =
  33. 33.Double 41 =
  34. 34.Half of 42 =
  35. 35.Double 46 =
  36. 36.Double 21 =
  37. 37.Double 68 =
  38. 38.Double 32 =
  39. 39.Double 89 =
  40. 40.Half of 32 =

Answer key

  1. 61
  2. 72
  3. 48
  4. 24
  5. 32
  6. 81
  7. 104
  8. 50
  9. 188
  10. 42
  11. 40
  12. 62
  13. 102
  14. 156
  15. 56
  16. 32
  17. 33
  18. 132
  19. 148
  20. 99
  21. 58
  22. 43
  23. 18
  24. 44
  25. 108
  26. 63
  27. 53
  28. 59
  29. 194
  30. 14
  31. 70
  32. 84
  33. 82
  34. 21
  35. 92
  36. 42
  37. 136
  38. 64
  39. 178
  40. 16

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