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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 708 · 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 50 =
  2. 2.Double 32 =
  3. 3.Half of 38 =
  4. 4.Double 17 =
  5. 5.Double 81 =
  6. 6.Double 43 =
  7. 7.Double 51 =
  8. 8.Double 68 =
  9. 9.Double 45 =
  10. 10.Half of 48 =
  11. 11.Double 35 =
  12. 12.Half of 188 =
  13. 13.Half of 116 =
  14. 14.Half of 40 =
  15. 15.Double 79 =
  16. 16.Half of 62 =
  17. 17.Double 23 =
  18. 18.Half of 104 =
  19. 19.Half of 118 =
  20. 20.Double 84 =
  21. 21.Double 31 =
  22. 22.Half of 126 =
  23. 23.Half of 128 =
  24. 24.Half of 190 =
  25. 25.Double 56 =
  26. 26.Half of 136 =
  27. 27.Double 39 =
  28. 28.Half of 52 =
  29. 29.Double 99 =
  30. 30.Half of 26 =
  31. 31.Double 73 =
  32. 32.Half of 154 =
  33. 33.Double 63 =
  34. 34.Double 25 =
  35. 35.Double 27 =
  36. 36.Half of 170 =
  37. 37.Half of 42 =
  38. 38.Double 41 =
  39. 39.Half of 112 =
  40. 40.Double 95 =

Answer key

  1. 25
  2. 64
  3. 19
  4. 34
  5. 162
  6. 86
  7. 102
  8. 136
  9. 90
  10. 24
  11. 70
  12. 94
  13. 58
  14. 20
  15. 158
  16. 31
  17. 46
  18. 52
  19. 59
  20. 168
  21. 62
  22. 63
  23. 64
  24. 95
  25. 112
  26. 68
  27. 78
  28. 26
  29. 198
  30. 13
  31. 146
  32. 77
  33. 126
  34. 50
  35. 54
  36. 85
  37. 21
  38. 82
  39. 56
  40. 190

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