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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 755 · 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 58 =
  2. 2.Half of 152 =
  3. 3.Half of 166 =
  4. 4.Half of 192 =
  5. 5.Half of 34 =
  6. 6.Half of 130 =
  7. 7.Double 93 =
  8. 8.Half of 56 =
  9. 9.Double 41 =
  10. 10.Double 51 =
  11. 11.Half of 54 =
  12. 12.Double 99 =
  13. 13.Double 45 =
  14. 14.Half of 76 =
  15. 15.Double 25 =
  16. 16.Half of 124 =
  17. 17.Half of 72 =
  18. 18.Half of 50 =
  19. 19.Half of 32 =
  20. 20.Half of 28 =
  21. 21.Double 88 =
  22. 22.Half of 106 =
  23. 23.Double 35 =
  24. 24.Half of 46 =
  25. 25.Half of 62 =
  26. 26.Half of 178 =
  27. 27.Double 31 =
  28. 28.Double 21 =
  29. 29.Double 52 =
  30. 30.Half of 128 =
  31. 31.Half of 146 =
  32. 32.Double 65 =
  33. 33.Half of 112 =
  34. 34.Double 46 =
  35. 35.Half of 96 =
  36. 36.Double 68 =
  37. 37.Half of 190 =
  38. 38.Double 24 =
  39. 39.Half of 88 =
  40. 40.Half of 68 =

Answer key

  1. 116
  2. 76
  3. 83
  4. 96
  5. 17
  6. 65
  7. 186
  8. 28
  9. 82
  10. 102
  11. 27
  12. 198
  13. 90
  14. 38
  15. 50
  16. 62
  17. 36
  18. 25
  19. 16
  20. 14
  21. 176
  22. 53
  23. 70
  24. 23
  25. 31
  26. 89
  27. 62
  28. 42
  29. 104
  30. 64
  31. 73
  32. 130
  33. 56
  34. 92
  35. 48
  36. 136
  37. 95
  38. 48
  39. 44
  40. 34

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