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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 66 · 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 76 =
  2. 2.Half of 92 =
  3. 3.Half of 60 =
  4. 4.Double 61 =
  5. 5.Half of 86 =
  6. 6.Half of 136 =
  7. 7.Double 25 =
  8. 8.Double 31 =
  9. 9.Half of 194 =
  10. 10.Half of 148 =
  11. 11.Half of 34 =
  12. 12.Half of 182 =
  13. 13.Double 35 =
  14. 14.Double 64 =
  15. 15.Double 91 =
  16. 16.Double 76 =
  17. 17.Double 99 =
  18. 18.Half of 124 =
  19. 19.Double 82 =
  20. 20.Double 33 =
  21. 21.Half of 48 =
  22. 22.Half of 80 =
  23. 23.Double 41 =
  24. 24.Half of 120 =
  25. 25.Double 55 =
  26. 26.Double 49 =
  27. 27.Double 17 =
  28. 28.Half of 138 =
  29. 29.Half of 144 =
  30. 30.Half of 64 =
  31. 31.Half of 108 =
  32. 32.Double 43 =
  33. 33.Double 46 =
  34. 34.Double 79 =
  35. 35.Double 78 =
  36. 36.Double 23 =
  37. 37.Double 94 =
  38. 38.Double 21 =
  39. 39.Double 65 =
  40. 40.Double 16 =

Answer key

  1. 38
  2. 46
  3. 30
  4. 122
  5. 43
  6. 68
  7. 50
  8. 62
  9. 97
  10. 74
  11. 17
  12. 91
  13. 70
  14. 128
  15. 182
  16. 152
  17. 198
  18. 62
  19. 164
  20. 66
  21. 24
  22. 40
  23. 82
  24. 60
  25. 110
  26. 98
  27. 34
  28. 69
  29. 72
  30. 32
  31. 54
  32. 86
  33. 92
  34. 158
  35. 156
  36. 46
  37. 188
  38. 42
  39. 130
  40. 32

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