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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 759 · 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 130 =
  2. 2.Double 99 =
  3. 3.Double 46 =
  4. 4.Half of 92 =
  5. 5.Double 49 =
  6. 6.Double 61 =
  7. 7.Half of 66 =
  8. 8.Double 35 =
  9. 9.Half of 148 =
  10. 10.Half of 68 =
  11. 11.Double 81 =
  12. 12.Half of 154 =
  13. 13.Half of 100 =
  14. 14.Half of 102 =
  15. 15.Half of 176 =
  16. 16.Double 97 =
  17. 17.Double 76 =
  18. 18.Double 64 =
  19. 19.Half of 188 =
  20. 20.Half of 94 =
  21. 21.Double 63 =
  22. 22.Half of 58 =
  23. 23.Half of 156 =
  24. 24.Half of 62 =
  25. 25.Half of 90 =
  26. 26.Double 41 =
  27. 27.Half of 80 =
  28. 28.Double 51 =
  29. 29.Double 38 =
  30. 30.Double 28 =
  31. 31.Half of 48 =
  32. 32.Half of 152 =
  33. 33.Half of 34 =
  34. 34.Half of 52 =
  35. 35.Double 52 =
  36. 36.Double 74 =
  37. 37.Half of 168 =
  38. 38.Half of 124 =
  39. 39.Half of 140 =
  40. 40.Half of 190 =

Answer key

  1. 65
  2. 198
  3. 92
  4. 46
  5. 98
  6. 122
  7. 33
  8. 70
  9. 74
  10. 34
  11. 162
  12. 77
  13. 50
  14. 51
  15. 88
  16. 194
  17. 152
  18. 128
  19. 94
  20. 47
  21. 126
  22. 29
  23. 78
  24. 31
  25. 45
  26. 82
  27. 40
  28. 102
  29. 76
  30. 56
  31. 24
  32. 76
  33. 17
  34. 26
  35. 104
  36. 148
  37. 84
  38. 62
  39. 70
  40. 95

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