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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 587 · 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 84 =
  2. 2.Double 92 =
  3. 3.Double 99 =
  4. 4.Double 73 =
  5. 5.Double 28 =
  6. 6.Double 91 =
  7. 7.Double 63 =
  8. 8.Half of 166 =
  9. 9.Double 67 =
  10. 10.Double 47 =
  11. 11.Double 79 =
  12. 12.Half of 156 =
  13. 13.Double 19 =
  14. 14.Double 55 =
  15. 15.Half of 160 =
  16. 16.Half of 30 =
  17. 17.Double 38 =
  18. 18.Double 36 =
  19. 19.Half of 48 =
  20. 20.Double 96 =
  21. 21.Double 45 =
  22. 22.Half of 34 =
  23. 23.Double 23 =
  24. 24.Double 97 =
  25. 25.Double 83 =
  26. 26.Half of 52 =
  27. 27.Half of 158 =
  28. 28.Half of 116 =
  29. 29.Double 21 =
  30. 30.Half of 72 =
  31. 31.Half of 124 =
  32. 32.Double 98 =
  33. 33.Half of 62 =
  34. 34.Double 39 =
  35. 35.Double 71 =
  36. 36.Half of 130 =
  37. 37.Half of 78 =
  38. 38.Half of 164 =
  39. 39.Half of 126 =
  40. 40.Double 51 =

Answer key

  1. 168
  2. 184
  3. 198
  4. 146
  5. 56
  6. 182
  7. 126
  8. 83
  9. 134
  10. 94
  11. 158
  12. 78
  13. 38
  14. 110
  15. 80
  16. 15
  17. 76
  18. 72
  19. 24
  20. 192
  21. 90
  22. 17
  23. 46
  24. 194
  25. 166
  26. 26
  27. 79
  28. 58
  29. 42
  30. 36
  31. 62
  32. 196
  33. 31
  34. 78
  35. 142
  36. 65
  37. 39
  38. 82
  39. 63
  40. 102

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