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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 124 · 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 124 =
  2. 2.Half of 86 =
  3. 3.Half of 80 =
  4. 4.Half of 178 =
  5. 5.Double 73 =
  6. 6.Double 41 =
  7. 7.Half of 74 =
  8. 8.Half of 198 =
  9. 9.Double 47 =
  10. 10.Double 32 =
  11. 11.Half of 170 =
  12. 12.Half of 70 =
  13. 13.Double 37 =
  14. 14.Half of 54 =
  15. 15.Half of 176 =
  16. 16.Half of 36 =
  17. 17.Half of 162 =
  18. 18.Half of 192 =
  19. 19.Half of 48 =
  20. 20.Double 68 =
  21. 21.Half of 34 =
  22. 22.Half of 78 =
  23. 23.Double 88 =
  24. 24.Double 62 =
  25. 25.Double 35 =
  26. 26.Half of 130 =
  27. 27.Half of 174 =
  28. 28.Double 94 =
  29. 29.Double 21 =
  30. 30.Double 63 =
  31. 31.Double 77 =
  32. 32.Half of 46 =
  33. 33.Double 97 =
  34. 34.Double 74 =
  35. 35.Double 65 =
  36. 36.Half of 180 =
  37. 37.Double 76 =
  38. 38.Double 81 =
  39. 39.Half of 40 =
  40. 40.Double 61 =

Answer key

  1. 62
  2. 43
  3. 40
  4. 89
  5. 146
  6. 82
  7. 37
  8. 99
  9. 94
  10. 64
  11. 85
  12. 35
  13. 74
  14. 27
  15. 88
  16. 18
  17. 81
  18. 96
  19. 24
  20. 136
  21. 17
  22. 39
  23. 176
  24. 124
  25. 70
  26. 65
  27. 87
  28. 188
  29. 42
  30. 126
  31. 154
  32. 23
  33. 194
  34. 148
  35. 130
  36. 90
  37. 152
  38. 162
  39. 20
  40. 122

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