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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 12 · 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 37 =
  2. 2.Half of 136 =
  3. 3.Half of 170 =
  4. 4.Double 43 =
  5. 5.Double 21 =
  6. 6.Half of 158 =
  7. 7.Double 76 =
  8. 8.Double 46 =
  9. 9.Double 64 =
  10. 10.Double 58 =
  11. 11.Double 89 =
  12. 12.Double 47 =
  13. 13.Double 36 =
  14. 14.Double 41 =
  15. 15.Double 57 =
  16. 16.Half of 64 =
  17. 17.Half of 148 =
  18. 18.Double 92 =
  19. 19.Half of 182 =
  20. 20.Half of 44 =
  21. 21.Double 29 =
  22. 22.Half of 138 =
  23. 23.Half of 90 =
  24. 24.Double 73 =
  25. 25.Double 99 =
  26. 26.Half of 166 =
  27. 27.Half of 190 =
  28. 28.Half of 74 =
  29. 29.Half of 192 =
  30. 30.Double 53 =
  31. 31.Double 25 =
  32. 32.Double 38 =
  33. 33.Half of 198 =
  34. 34.Double 93 =
  35. 35.Half of 116 =
  36. 36.Double 95 =
  37. 37.Double 54 =
  38. 38.Half of 46 =
  39. 39.Half of 68 =
  40. 40.Half of 106 =

Answer key

  1. 74
  2. 68
  3. 85
  4. 86
  5. 42
  6. 79
  7. 152
  8. 92
  9. 128
  10. 116
  11. 178
  12. 94
  13. 72
  14. 82
  15. 114
  16. 32
  17. 74
  18. 184
  19. 91
  20. 22
  21. 58
  22. 69
  23. 45
  24. 146
  25. 198
  26. 83
  27. 95
  28. 37
  29. 96
  30. 106
  31. 50
  32. 76
  33. 99
  34. 186
  35. 58
  36. 190
  37. 108
  38. 23
  39. 34
  40. 53

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