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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 402 · 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 144 =
  2. 2.Double 58 =
  3. 3.Half of 198 =
  4. 4.Double 37 =
  5. 5.Double 71 =
  6. 6.Half of 78 =
  7. 7.Double 27 =
  8. 8.Half of 160 =
  9. 9.Double 75 =
  10. 10.Half of 170 =
  11. 11.Double 42 =
  12. 12.Half of 84 =
  13. 13.Double 24 =
  14. 14.Double 51 =
  15. 15.Double 47 =
  16. 16.Double 88 =
  17. 17.Double 93 =
  18. 18.Half of 32 =
  19. 19.Double 28 =
  20. 20.Double 25 =
  21. 21.Half of 64 =
  22. 22.Half of 96 =
  23. 23.Double 91 =
  24. 24.Double 68 =
  25. 25.Half of 194 =
  26. 26.Half of 154 =
  27. 27.Half of 30 =
  28. 28.Double 61 =
  29. 29.Half of 146 =
  30. 30.Half of 36 =
  31. 31.Half of 118 =
  32. 32.Half of 136 =
  33. 33.Double 41 =
  34. 34.Half of 92 =
  35. 35.Double 32 =
  36. 36.Half of 34 =
  37. 37.Double 36 =
  38. 38.Double 66 =
  39. 39.Half of 48 =
  40. 40.Double 48 =

Answer key

  1. 72
  2. 116
  3. 99
  4. 74
  5. 142
  6. 39
  7. 54
  8. 80
  9. 150
  10. 85
  11. 84
  12. 42
  13. 48
  14. 102
  15. 94
  16. 176
  17. 186
  18. 16
  19. 56
  20. 50
  21. 32
  22. 48
  23. 182
  24. 136
  25. 97
  26. 77
  27. 15
  28. 122
  29. 73
  30. 18
  31. 59
  32. 68
  33. 82
  34. 46
  35. 64
  36. 17
  37. 72
  38. 132
  39. 24
  40. 96

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