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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 152 · 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 174 =
  2. 2.Half of 184 =
  3. 3.Double 18 =
  4. 4.Half of 42 =
  5. 5.Half of 128 =
  6. 6.Half of 116 =
  7. 7.Double 52 =
  8. 8.Half of 122 =
  9. 9.Double 36 =
  10. 10.Double 96 =
  11. 11.Half of 108 =
  12. 12.Double 21 =
  13. 13.Double 44 =
  14. 14.Double 22 =
  15. 15.Half of 150 =
  16. 16.Double 38 =
  17. 17.Double 34 =
  18. 18.Double 41 =
  19. 19.Half of 96 =
  20. 20.Half of 176 =
  21. 21.Double 66 =
  22. 22.Double 24 =
  23. 23.Double 42 =
  24. 24.Half of 102 =
  25. 25.Half of 198 =
  26. 26.Half of 148 =
  27. 27.Double 93 =
  28. 28.Double 68 =
  29. 29.Double 17 =
  30. 30.Double 32 =
  31. 31.Double 62 =
  32. 32.Half of 50 =
  33. 33.Double 89 =
  34. 34.Double 76 =
  35. 35.Half of 170 =
  36. 36.Double 65 =
  37. 37.Double 63 =
  38. 38.Half of 134 =
  39. 39.Double 64 =
  40. 40.Double 23 =

Answer key

  1. 87
  2. 92
  3. 36
  4. 21
  5. 64
  6. 58
  7. 104
  8. 61
  9. 72
  10. 192
  11. 54
  12. 42
  13. 88
  14. 44
  15. 75
  16. 76
  17. 68
  18. 82
  19. 48
  20. 88
  21. 132
  22. 48
  23. 84
  24. 51
  25. 99
  26. 74
  27. 186
  28. 136
  29. 34
  30. 64
  31. 124
  32. 25
  33. 178
  34. 152
  35. 85
  36. 130
  37. 126
  38. 67
  39. 128
  40. 46

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