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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 773 · 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 36 =
  2. 2.Half of 156 =
  3. 3.Double 46 =
  4. 4.Double 44 =
  5. 5.Double 71 =
  6. 6.Double 61 =
  7. 7.Half of 126 =
  8. 8.Double 53 =
  9. 9.Half of 102 =
  10. 10.Double 28 =
  11. 11.Half of 64 =
  12. 12.Half of 26 =
  13. 13.Double 43 =
  14. 14.Double 86 =
  15. 15.Half of 148 =
  16. 16.Double 52 =
  17. 17.Half of 32 =
  18. 18.Double 24 =
  19. 19.Half of 190 =
  20. 20.Half of 124 =
  21. 21.Half of 152 =
  22. 22.Half of 182 =
  23. 23.Double 27 =
  24. 24.Half of 140 =
  25. 25.Double 25 =
  26. 26.Half of 40 =
  27. 27.Half of 198 =
  28. 28.Double 37 =
  29. 29.Double 51 =
  30. 30.Double 29 =
  31. 31.Double 78 =
  32. 32.Double 79 =
  33. 33.Double 21 =
  34. 34.Double 45 =
  35. 35.Double 31 =
  36. 36.Double 23 =
  37. 37.Half of 132 =
  38. 38.Double 32 =
  39. 39.Half of 130 =
  40. 40.Double 98 =

Answer key

  1. 18
  2. 78
  3. 92
  4. 88
  5. 142
  6. 122
  7. 63
  8. 106
  9. 51
  10. 56
  11. 32
  12. 13
  13. 86
  14. 172
  15. 74
  16. 104
  17. 16
  18. 48
  19. 95
  20. 62
  21. 76
  22. 91
  23. 54
  24. 70
  25. 50
  26. 20
  27. 99
  28. 74
  29. 102
  30. 58
  31. 156
  32. 158
  33. 42
  34. 90
  35. 62
  36. 46
  37. 66
  38. 64
  39. 65
  40. 196

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