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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 392 · 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 61 =
  2. 2.Half of 160 =
  3. 3.Double 51 =
  4. 4.Half of 198 =
  5. 5.Double 63 =
  6. 6.Half of 44 =
  7. 7.Double 44 =
  8. 8.Double 66 =
  9. 9.Double 67 =
  10. 10.Double 91 =
  11. 11.Half of 196 =
  12. 12.Double 54 =
  13. 13.Half of 194 =
  14. 14.Double 26 =
  15. 15.Double 76 =
  16. 16.Half of 174 =
  17. 17.Double 36 =
  18. 18.Half of 134 =
  19. 19.Half of 34 =
  20. 20.Half of 102 =
  21. 21.Half of 36 =
  22. 22.Double 71 =
  23. 23.Half of 142 =
  24. 24.Double 88 =
  25. 25.Double 53 =
  26. 26.Half of 186 =
  27. 27.Half of 108 =
  28. 28.Double 19 =
  29. 29.Half of 32 =
  30. 30.Double 57 =
  31. 31.Half of 104 =
  32. 32.Double 68 =
  33. 33.Half of 70 =
  34. 34.Double 56 =
  35. 35.Half of 190 =
  36. 36.Half of 150 =
  37. 37.Double 16 =
  38. 38.Double 41 =
  39. 39.Half of 120 =
  40. 40.Half of 80 =

Answer key

  1. 122
  2. 80
  3. 102
  4. 99
  5. 126
  6. 22
  7. 88
  8. 132
  9. 134
  10. 182
  11. 98
  12. 108
  13. 97
  14. 52
  15. 152
  16. 87
  17. 72
  18. 67
  19. 17
  20. 51
  21. 18
  22. 142
  23. 71
  24. 176
  25. 106
  26. 93
  27. 54
  28. 38
  29. 16
  30. 114
  31. 52
  32. 136
  33. 35
  34. 112
  35. 95
  36. 75
  37. 32
  38. 82
  39. 60
  40. 40

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