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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 510 · 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.Double 18 =
  3. 3.Half of 184 =
  4. 4.Double 78 =
  5. 5.Double 85 =
  6. 6.Double 69 =
  7. 7.Half of 100 =
  8. 8.Double 64 =
  9. 9.Double 39 =
  10. 10.Double 48 =
  11. 11.Half of 132 =
  12. 12.Half of 174 =
  13. 13.Half of 70 =
  14. 14.Half of 68 =
  15. 15.Double 75 =
  16. 16.Half of 76 =
  17. 17.Double 76 =
  18. 18.Half of 62 =
  19. 19.Double 81 =
  20. 20.Half of 166 =
  21. 21.Half of 130 =
  22. 22.Double 43 =
  23. 23.Double 56 =
  24. 24.Double 23 =
  25. 25.Double 72 =
  26. 26.Half of 56 =
  27. 27.Double 91 =
  28. 28.Double 29 =
  29. 29.Half of 156 =
  30. 30.Half of 144 =
  31. 31.Double 51 =
  32. 32.Double 71 =
  33. 33.Double 96 =
  34. 34.Half of 148 =
  35. 35.Half of 124 =
  36. 36.Half of 196 =
  37. 37.Half of 142 =
  38. 38.Double 44 =
  39. 39.Double 84 =
  40. 40.Double 25 =

Answer key

  1. 32
  2. 36
  3. 92
  4. 156
  5. 170
  6. 138
  7. 50
  8. 128
  9. 78
  10. 96
  11. 66
  12. 87
  13. 35
  14. 34
  15. 150
  16. 38
  17. 152
  18. 31
  19. 162
  20. 83
  21. 65
  22. 86
  23. 112
  24. 46
  25. 144
  26. 28
  27. 182
  28. 58
  29. 78
  30. 72
  31. 102
  32. 142
  33. 192
  34. 74
  35. 62
  36. 98
  37. 71
  38. 88
  39. 168
  40. 50

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