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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 828 · 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 71 =
  2. 2.Double 58 =
  3. 3.Half of 90 =
  4. 4.Half of 190 =
  5. 5.Double 79 =
  6. 6.Double 17 =
  7. 7.Double 22 =
  8. 8.Double 34 =
  9. 9.Double 21 =
  10. 10.Double 37 =
  11. 11.Double 49 =
  12. 12.Half of 170 =
  13. 13.Half of 86 =
  14. 14.Double 81 =
  15. 15.Double 74 =
  16. 16.Half of 32 =
  17. 17.Half of 96 =
  18. 18.Half of 162 =
  19. 19.Half of 114 =
  20. 20.Half of 30 =
  21. 21.Double 23 =
  22. 22.Half of 26 =
  23. 23.Half of 76 =
  24. 24.Half of 92 =
  25. 25.Half of 132 =
  26. 26.Half of 102 =
  27. 27.Half of 52 =
  28. 28.Double 44 =
  29. 29.Half of 48 =
  30. 30.Double 56 =
  31. 31.Double 51 =
  32. 32.Half of 70 =
  33. 33.Half of 56 =
  34. 34.Double 41 =
  35. 35.Double 73 =
  36. 36.Half of 36 =
  37. 37.Double 96 =
  38. 38.Half of 144 =
  39. 39.Double 65 =
  40. 40.Half of 82 =

Answer key

  1. 142
  2. 116
  3. 45
  4. 95
  5. 158
  6. 34
  7. 44
  8. 68
  9. 42
  10. 74
  11. 98
  12. 85
  13. 43
  14. 162
  15. 148
  16. 16
  17. 48
  18. 81
  19. 57
  20. 15
  21. 46
  22. 13
  23. 38
  24. 46
  25. 66
  26. 51
  27. 26
  28. 88
  29. 24
  30. 112
  31. 102
  32. 35
  33. 28
  34. 82
  35. 146
  36. 18
  37. 192
  38. 72
  39. 130
  40. 41

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