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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 55 · 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 112 =
  2. 2.Double 19 =
  3. 3.Half of 124 =
  4. 4.Double 27 =
  5. 5.Half of 144 =
  6. 6.Double 49 =
  7. 7.Double 74 =
  8. 8.Double 24 =
  9. 9.Half of 104 =
  10. 10.Half of 148 =
  11. 11.Half of 196 =
  12. 12.Half of 56 =
  13. 13.Half of 164 =
  14. 14.Half of 48 =
  15. 15.Half of 198 =
  16. 16.Half of 96 =
  17. 17.Half of 170 =
  18. 18.Half of 82 =
  19. 19.Half of 132 =
  20. 20.Half of 76 =
  21. 21.Double 21 =
  22. 22.Double 44 =
  23. 23.Double 41 =
  24. 24.Half of 62 =
  25. 25.Half of 26 =
  26. 26.Double 65 =
  27. 27.Double 71 =
  28. 28.Half of 98 =
  29. 29.Double 46 =
  30. 30.Half of 184 =
  31. 31.Double 47 =
  32. 32.Half of 188 =
  33. 33.Half of 154 =
  34. 34.Half of 160 =
  35. 35.Half of 70 =
  36. 36.Half of 102 =
  37. 37.Double 68 =
  38. 38.Double 66 =
  39. 39.Double 61 =
  40. 40.Half of 190 =

Answer key

  1. 56
  2. 38
  3. 62
  4. 54
  5. 72
  6. 98
  7. 148
  8. 48
  9. 52
  10. 74
  11. 98
  12. 28
  13. 82
  14. 24
  15. 99
  16. 48
  17. 85
  18. 41
  19. 66
  20. 38
  21. 42
  22. 88
  23. 82
  24. 31
  25. 13
  26. 130
  27. 142
  28. 49
  29. 92
  30. 92
  31. 94
  32. 94
  33. 77
  34. 80
  35. 35
  36. 51
  37. 136
  38. 132
  39. 122
  40. 95

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