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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 546 · 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 18 =
  2. 2.Double 31 =
  3. 3.Half of 142 =
  4. 4.Half of 94 =
  5. 5.Double 71 =
  6. 6.Half of 46 =
  7. 7.Half of 170 =
  8. 8.Half of 168 =
  9. 9.Double 39 =
  10. 10.Double 91 =
  11. 11.Half of 76 =
  12. 12.Double 51 =
  13. 13.Half of 48 =
  14. 14.Half of 106 =
  15. 15.Half of 42 =
  16. 16.Half of 100 =
  17. 17.Half of 28 =
  18. 18.Double 38 =
  19. 19.Double 76 =
  20. 20.Half of 90 =
  21. 21.Half of 192 =
  22. 22.Half of 154 =
  23. 23.Half of 86 =
  24. 24.Double 43 =
  25. 25.Double 28 =
  26. 26.Half of 148 =
  27. 27.Double 17 =
  28. 28.Double 81 =
  29. 29.Half of 138 =
  30. 30.Half of 30 =
  31. 31.Double 86 =
  32. 32.Half of 62 =
  33. 33.Double 35 =
  34. 34.Half of 64 =
  35. 35.Double 73 =
  36. 36.Half of 52 =
  37. 37.Half of 136 =
  38. 38.Double 56 =
  39. 39.Half of 152 =
  40. 40.Double 26 =

Answer key

  1. 36
  2. 62
  3. 71
  4. 47
  5. 142
  6. 23
  7. 85
  8. 84
  9. 78
  10. 182
  11. 38
  12. 102
  13. 24
  14. 53
  15. 21
  16. 50
  17. 14
  18. 76
  19. 152
  20. 45
  21. 96
  22. 77
  23. 43
  24. 86
  25. 56
  26. 74
  27. 34
  28. 162
  29. 69
  30. 15
  31. 172
  32. 31
  33. 70
  34. 32
  35. 146
  36. 26
  37. 68
  38. 112
  39. 76
  40. 52

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