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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 610 · 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 16 =
  2. 2.Half of 198 =
  3. 3.Double 72 =
  4. 4.Double 63 =
  5. 5.Half of 172 =
  6. 6.Half of 136 =
  7. 7.Double 51 =
  8. 8.Double 19 =
  9. 9.Half of 196 =
  10. 10.Half of 182 =
  11. 11.Half of 168 =
  12. 12.Double 46 =
  13. 13.Half of 114 =
  14. 14.Double 47 =
  15. 15.Double 79 =
  16. 16.Double 59 =
  17. 17.Double 91 =
  18. 18.Half of 178 =
  19. 19.Double 17 =
  20. 20.Double 22 =
  21. 21.Double 61 =
  22. 22.Double 37 =
  23. 23.Half of 174 =
  24. 24.Double 73 =
  25. 25.Half of 52 =
  26. 26.Double 48 =
  27. 27.Half of 102 =
  28. 28.Double 21 =
  29. 29.Half of 138 =
  30. 30.Half of 66 =
  31. 31.Half of 42 =
  32. 32.Double 93 =
  33. 33.Double 95 =
  34. 34.Double 31 =
  35. 35.Half of 54 =
  36. 36.Double 29 =
  37. 37.Double 34 =
  38. 38.Double 97 =
  39. 39.Half of 72 =
  40. 40.Half of 152 =

Answer key

  1. 32
  2. 99
  3. 144
  4. 126
  5. 86
  6. 68
  7. 102
  8. 38
  9. 98
  10. 91
  11. 84
  12. 92
  13. 57
  14. 94
  15. 158
  16. 118
  17. 182
  18. 89
  19. 34
  20. 44
  21. 122
  22. 74
  23. 87
  24. 146
  25. 26
  26. 96
  27. 51
  28. 42
  29. 69
  30. 33
  31. 21
  32. 186
  33. 190
  34. 62
  35. 27
  36. 58
  37. 68
  38. 194
  39. 36
  40. 76

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