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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 172 · 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 72 =
  2. 2.Double 95 =
  3. 3.Half of 88 =
  4. 4.Half of 138 =
  5. 5.Half of 130 =
  6. 6.Half of 80 =
  7. 7.Double 32 =
  8. 8.Half of 154 =
  9. 9.Double 36 =
  10. 10.Half of 112 =
  11. 11.Half of 196 =
  12. 12.Half of 186 =
  13. 13.Double 78 =
  14. 14.Half of 190 =
  15. 15.Double 91 =
  16. 16.Half of 44 =
  17. 17.Double 87 =
  18. 18.Double 27 =
  19. 19.Half of 62 =
  20. 20.Half of 64 =
  21. 21.Double 29 =
  22. 22.Double 42 =
  23. 23.Half of 124 =
  24. 24.Double 16 =
  25. 25.Half of 156 =
  26. 26.Double 33 =
  27. 27.Double 26 =
  28. 28.Half of 50 =
  29. 29.Half of 86 =
  30. 30.Double 59 =
  31. 31.Double 82 =
  32. 32.Half of 94 =
  33. 33.Double 46 =
  34. 34.Half of 164 =
  35. 35.Double 49 =
  36. 36.Half of 116 =
  37. 37.Half of 114 =
  38. 38.Half of 148 =
  39. 39.Half of 118 =
  40. 40.Double 67 =

Answer key

  1. 144
  2. 190
  3. 44
  4. 69
  5. 65
  6. 40
  7. 64
  8. 77
  9. 72
  10. 56
  11. 98
  12. 93
  13. 156
  14. 95
  15. 182
  16. 22
  17. 174
  18. 54
  19. 31
  20. 32
  21. 58
  22. 84
  23. 62
  24. 32
  25. 78
  26. 66
  27. 52
  28. 25
  29. 43
  30. 118
  31. 164
  32. 47
  33. 92
  34. 82
  35. 98
  36. 58
  37. 57
  38. 74
  39. 59
  40. 134

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