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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 560 · 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 186 =
  2. 2.Double 35 =
  3. 3.Half of 150 =
  4. 4.Double 66 =
  5. 5.Double 63 =
  6. 6.Half of 162 =
  7. 7.Double 34 =
  8. 8.Double 98 =
  9. 9.Double 58 =
  10. 10.Half of 36 =
  11. 11.Double 16 =
  12. 12.Double 31 =
  13. 13.Double 17 =
  14. 14.Double 28 =
  15. 15.Half of 52 =
  16. 16.Double 64 =
  17. 17.Half of 88 =
  18. 18.Double 23 =
  19. 19.Double 61 =
  20. 20.Half of 112 =
  21. 21.Half of 178 =
  22. 22.Half of 30 =
  23. 23.Double 29 =
  24. 24.Half of 60 =
  25. 25.Half of 76 =
  26. 26.Half of 120 =
  27. 27.Double 44 =
  28. 28.Half of 96 =
  29. 29.Half of 154 =
  30. 30.Double 51 =
  31. 31.Double 86 =
  32. 32.Half of 134 =
  33. 33.Double 55 =
  34. 34.Half of 126 =
  35. 35.Half of 172 =
  36. 36.Double 19 =
  37. 37.Half of 182 =
  38. 38.Double 37 =
  39. 39.Half of 122 =
  40. 40.Double 96 =

Answer key

  1. 93
  2. 70
  3. 75
  4. 132
  5. 126
  6. 81
  7. 68
  8. 196
  9. 116
  10. 18
  11. 32
  12. 62
  13. 34
  14. 56
  15. 26
  16. 128
  17. 44
  18. 46
  19. 122
  20. 56
  21. 89
  22. 15
  23. 58
  24. 30
  25. 38
  26. 60
  27. 88
  28. 48
  29. 77
  30. 102
  31. 172
  32. 67
  33. 110
  34. 63
  35. 86
  36. 38
  37. 91
  38. 74
  39. 61
  40. 192

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