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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 745 · 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 53 =
  2. 2.Double 97 =
  3. 3.Double 93 =
  4. 4.Half of 120 =
  5. 5.Double 62 =
  6. 6.Double 31 =
  7. 7.Half of 126 =
  8. 8.Double 55 =
  9. 9.Double 49 =
  10. 10.Half of 172 =
  11. 11.Double 61 =
  12. 12.Half of 98 =
  13. 13.Double 65 =
  14. 14.Half of 142 =
  15. 15.Double 59 =
  16. 16.Double 52 =
  17. 17.Double 68 =
  18. 18.Double 51 =
  19. 19.Double 45 =
  20. 20.Half of 78 =
  21. 21.Half of 186 =
  22. 22.Half of 162 =
  23. 23.Half of 156 =
  24. 24.Half of 68 =
  25. 25.Double 22 =
  26. 26.Double 44 =
  27. 27.Half of 30 =
  28. 28.Half of 86 =
  29. 29.Half of 194 =
  30. 30.Double 16 =
  31. 31.Double 39 =
  32. 32.Half of 176 =
  33. 33.Half of 104 =
  34. 34.Half of 44 =
  35. 35.Double 47 =
  36. 36.Half of 50 =
  37. 37.Half of 152 =
  38. 38.Half of 84 =
  39. 39.Half of 128 =
  40. 40.Double 91 =

Answer key

  1. 106
  2. 194
  3. 186
  4. 60
  5. 124
  6. 62
  7. 63
  8. 110
  9. 98
  10. 86
  11. 122
  12. 49
  13. 130
  14. 71
  15. 118
  16. 104
  17. 136
  18. 102
  19. 90
  20. 39
  21. 93
  22. 81
  23. 78
  24. 34
  25. 44
  26. 88
  27. 15
  28. 43
  29. 97
  30. 32
  31. 78
  32. 88
  33. 52
  34. 22
  35. 94
  36. 25
  37. 76
  38. 42
  39. 64
  40. 182

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