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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 359 · 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 38 =
  2. 2.Double 61 =
  3. 3.Double 62 =
  4. 4.Double 31 =
  5. 5.Double 51 =
  6. 6.Half of 190 =
  7. 7.Double 57 =
  8. 8.Half of 170 =
  9. 9.Double 21 =
  10. 10.Half of 58 =
  11. 11.Half of 168 =
  12. 12.Half of 182 =
  13. 13.Double 26 =
  14. 14.Double 69 =
  15. 15.Half of 70 =
  16. 16.Half of 148 =
  17. 17.Half of 110 =
  18. 18.Double 24 =
  19. 19.Half of 36 =
  20. 20.Double 74 =
  21. 21.Double 56 =
  22. 22.Half of 192 =
  23. 23.Half of 128 =
  24. 24.Double 29 =
  25. 25.Half of 194 =
  26. 26.Half of 56 =
  27. 27.Double 98 =
  28. 28.Half of 176 =
  29. 29.Half of 196 =
  30. 30.Half of 114 =
  31. 31.Half of 158 =
  32. 32.Half of 76 =
  33. 33.Half of 64 =
  34. 34.Half of 164 =
  35. 35.Half of 34 =
  36. 36.Half of 144 =
  37. 37.Half of 106 =
  38. 38.Half of 102 =
  39. 39.Half of 32 =
  40. 40.Half of 52 =

Answer key

  1. 76
  2. 122
  3. 124
  4. 62
  5. 102
  6. 95
  7. 114
  8. 85
  9. 42
  10. 29
  11. 84
  12. 91
  13. 52
  14. 138
  15. 35
  16. 74
  17. 55
  18. 48
  19. 18
  20. 148
  21. 112
  22. 96
  23. 64
  24. 58
  25. 97
  26. 28
  27. 196
  28. 88
  29. 98
  30. 57
  31. 79
  32. 38
  33. 32
  34. 82
  35. 17
  36. 72
  37. 53
  38. 51
  39. 16
  40. 26

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