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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 836 · 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 17 =
  2. 2.Double 75 =
  3. 3.Half of 164 =
  4. 4.Double 72 =
  5. 5.Double 92 =
  6. 6.Double 48 =
  7. 7.Double 54 =
  8. 8.Half of 44 =
  9. 9.Double 26 =
  10. 10.Half of 160 =
  11. 11.Half of 116 =
  12. 12.Double 51 =
  13. 13.Double 71 =
  14. 14.Half of 194 =
  15. 15.Double 97 =
  16. 16.Half of 190 =
  17. 17.Double 16 =
  18. 18.Double 25 =
  19. 19.Half of 144 =
  20. 20.Double 43 =
  21. 21.Double 36 =
  22. 22.Half of 90 =
  23. 23.Half of 62 =
  24. 24.Double 73 =
  25. 25.Double 76 =
  26. 26.Double 88 =
  27. 27.Half of 134 =
  28. 28.Double 21 =
  29. 29.Half of 196 =
  30. 30.Half of 182 =
  31. 31.Double 67 =
  32. 32.Half of 176 =
  33. 33.Double 35 =
  34. 34.Half of 188 =
  35. 35.Half of 172 =
  36. 36.Double 39 =
  37. 37.Half of 108 =
  38. 38.Double 28 =
  39. 39.Double 68 =
  40. 40.Double 64 =

Answer key

  1. 34
  2. 150
  3. 82
  4. 144
  5. 184
  6. 96
  7. 108
  8. 22
  9. 52
  10. 80
  11. 58
  12. 102
  13. 142
  14. 97
  15. 194
  16. 95
  17. 32
  18. 50
  19. 72
  20. 86
  21. 72
  22. 45
  23. 31
  24. 146
  25. 152
  26. 176
  27. 67
  28. 42
  29. 98
  30. 91
  31. 134
  32. 88
  33. 70
  34. 94
  35. 86
  36. 78
  37. 54
  38. 56
  39. 136
  40. 128

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