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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 188 · 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 61 =
  2. 2.Half of 48 =
  3. 3.Double 38 =
  4. 4.Double 32 =
  5. 5.Double 65 =
  6. 6.Double 41 =
  7. 7.Double 96 =
  8. 8.Half of 176 =
  9. 9.Double 89 =
  10. 10.Double 47 =
  11. 11.Double 66 =
  12. 12.Double 91 =
  13. 13.Double 49 =
  14. 14.Double 57 =
  15. 15.Half of 148 =
  16. 16.Half of 140 =
  17. 17.Double 99 =
  18. 18.Double 63 =
  19. 19.Double 59 =
  20. 20.Double 24 =
  21. 21.Half of 70 =
  22. 22.Half of 184 =
  23. 23.Half of 92 =
  24. 24.Double 82 =
  25. 25.Double 23 =
  26. 26.Double 54 =
  27. 27.Half of 172 =
  28. 28.Double 16 =
  29. 29.Double 94 =
  30. 30.Half of 50 =
  31. 31.Half of 160 =
  32. 32.Half of 84 =
  33. 33.Half of 166 =
  34. 34.Double 51 =
  35. 35.Half of 68 =
  36. 36.Double 36 =
  37. 37.Double 81 =
  38. 38.Double 56 =
  39. 39.Double 25 =
  40. 40.Half of 156 =

Answer key

  1. 122
  2. 24
  3. 76
  4. 64
  5. 130
  6. 82
  7. 192
  8. 88
  9. 178
  10. 94
  11. 132
  12. 182
  13. 98
  14. 114
  15. 74
  16. 70
  17. 198
  18. 126
  19. 118
  20. 48
  21. 35
  22. 92
  23. 46
  24. 164
  25. 46
  26. 108
  27. 86
  28. 32
  29. 188
  30. 25
  31. 80
  32. 42
  33. 83
  34. 102
  35. 34
  36. 72
  37. 162
  38. 112
  39. 50
  40. 78

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