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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 533 · 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 99 =
  2. 2.Half of 176 =
  3. 3.Double 61 =
  4. 4.Half of 196 =
  5. 5.Half of 50 =
  6. 6.Double 85 =
  7. 7.Half of 168 =
  8. 8.Half of 112 =
  9. 9.Half of 80 =
  10. 10.Half of 34 =
  11. 11.Half of 156 =
  12. 12.Half of 126 =
  13. 13.Half of 28 =
  14. 14.Half of 40 =
  15. 15.Half of 82 =
  16. 16.Double 59 =
  17. 17.Half of 46 =
  18. 18.Half of 32 =
  19. 19.Half of 72 =
  20. 20.Double 71 =
  21. 21.Half of 30 =
  22. 22.Double 56 =
  23. 23.Half of 198 =
  24. 24.Half of 128 =
  25. 25.Double 31 =
  26. 26.Double 78 =
  27. 27.Double 89 =
  28. 28.Double 63 =
  29. 29.Half of 98 =
  30. 30.Half of 64 =
  31. 31.Half of 36 =
  32. 32.Half of 74 =
  33. 33.Double 53 =
  34. 34.Double 52 =
  35. 35.Half of 130 =
  36. 36.Double 91 =
  37. 37.Double 84 =
  38. 38.Half of 92 =
  39. 39.Half of 48 =
  40. 40.Double 34 =

Answer key

  1. 198
  2. 88
  3. 122
  4. 98
  5. 25
  6. 170
  7. 84
  8. 56
  9. 40
  10. 17
  11. 78
  12. 63
  13. 14
  14. 20
  15. 41
  16. 118
  17. 23
  18. 16
  19. 36
  20. 142
  21. 15
  22. 112
  23. 99
  24. 64
  25. 62
  26. 156
  27. 178
  28. 126
  29. 49
  30. 32
  31. 18
  32. 37
  33. 106
  34. 104
  35. 65
  36. 182
  37. 168
  38. 46
  39. 24
  40. 68

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