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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 663 · 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 106 =
  2. 2.Half of 42 =
  3. 3.Half of 130 =
  4. 4.Half of 122 =
  5. 5.Double 57 =
  6. 6.Double 59 =
  7. 7.Double 98 =
  8. 8.Double 19 =
  9. 9.Half of 146 =
  10. 10.Double 27 =
  11. 11.Double 75 =
  12. 12.Half of 86 =
  13. 13.Half of 30 =
  14. 14.Double 46 =
  15. 15.Double 96 =
  16. 16.Half of 98 =
  17. 17.Half of 70 =
  18. 18.Double 37 =
  19. 19.Half of 180 =
  20. 20.Double 99 =
  21. 21.Double 97 =
  22. 22.Half of 172 =
  23. 23.Double 86 =
  24. 24.Half of 56 =
  25. 25.Half of 26 =
  26. 26.Half of 144 =
  27. 27.Double 44 =
  28. 28.Double 93 =
  29. 29.Half of 140 =
  30. 30.Half of 186 =
  31. 31.Double 71 =
  32. 32.Double 47 =
  33. 33.Half of 162 =
  34. 34.Half of 54 =
  35. 35.Double 34 =
  36. 36.Double 24 =
  37. 37.Half of 92 =
  38. 38.Half of 134 =
  39. 39.Half of 128 =
  40. 40.Double 42 =

Answer key

  1. 53
  2. 21
  3. 65
  4. 61
  5. 114
  6. 118
  7. 196
  8. 38
  9. 73
  10. 54
  11. 150
  12. 43
  13. 15
  14. 92
  15. 192
  16. 49
  17. 35
  18. 74
  19. 90
  20. 198
  21. 194
  22. 86
  23. 172
  24. 28
  25. 13
  26. 72
  27. 88
  28. 186
  29. 70
  30. 93
  31. 142
  32. 94
  33. 81
  34. 27
  35. 68
  36. 48
  37. 46
  38. 67
  39. 64
  40. 84

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