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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 824 · 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 87 =
  2. 2.Double 76 =
  3. 3.Half of 86 =
  4. 4.Double 51 =
  5. 5.Double 39 =
  6. 6.Half of 66 =
  7. 7.Double 92 =
  8. 8.Half of 174 =
  9. 9.Half of 170 =
  10. 10.Half of 64 =
  11. 11.Half of 118 =
  12. 12.Half of 34 =
  13. 13.Half of 88 =
  14. 14.Double 22 =
  15. 15.Double 31 =
  16. 16.Double 28 =
  17. 17.Double 38 =
  18. 18.Half of 102 =
  19. 19.Half of 182 =
  20. 20.Double 35 =
  21. 21.Half of 90 =
  22. 22.Double 81 =
  23. 23.Double 53 =
  24. 24.Double 32 =
  25. 25.Half of 172 =
  26. 26.Double 59 =
  27. 27.Half of 72 =
  28. 28.Half of 132 =
  29. 29.Half of 26 =
  30. 30.Double 73 =
  31. 31.Double 37 =
  32. 32.Half of 52 =
  33. 33.Half of 188 =
  34. 34.Double 96 =
  35. 35.Double 49 =
  36. 36.Half of 162 =
  37. 37.Double 72 =
  38. 38.Half of 76 =
  39. 39.Double 16 =
  40. 40.Half of 28 =

Answer key

  1. 174
  2. 152
  3. 43
  4. 102
  5. 78
  6. 33
  7. 184
  8. 87
  9. 85
  10. 32
  11. 59
  12. 17
  13. 44
  14. 44
  15. 62
  16. 56
  17. 76
  18. 51
  19. 91
  20. 70
  21. 45
  22. 162
  23. 106
  24. 64
  25. 86
  26. 118
  27. 36
  28. 66
  29. 13
  30. 146
  31. 74
  32. 26
  33. 94
  34. 192
  35. 98
  36. 81
  37. 144
  38. 38
  39. 32
  40. 14

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