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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 730 · 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 39 =
  2. 2.Double 77 =
  3. 3.Half of 72 =
  4. 4.Double 17 =
  5. 5.Double 94 =
  6. 6.Double 16 =
  7. 7.Double 47 =
  8. 8.Double 52 =
  9. 9.Half of 198 =
  10. 10.Half of 28 =
  11. 11.Half of 96 =
  12. 12.Double 92 =
  13. 13.Double 61 =
  14. 14.Half of 140 =
  15. 15.Half of 182 =
  16. 16.Double 21 =
  17. 17.Double 41 =
  18. 18.Half of 172 =
  19. 19.Double 26 =
  20. 20.Double 28 =
  21. 21.Double 36 =
  22. 22.Half of 70 =
  23. 23.Half of 68 =
  24. 24.Double 98 =
  25. 25.Double 32 =
  26. 26.Half of 34 =
  27. 27.Half of 118 =
  28. 28.Double 51 =
  29. 29.Double 57 =
  30. 30.Half of 100 =
  31. 31.Half of 88 =
  32. 32.Half of 40 =
  33. 33.Double 31 =
  34. 34.Half of 154 =
  35. 35.Double 62 =
  36. 36.Half of 116 =
  37. 37.Double 18 =
  38. 38.Double 95 =
  39. 39.Double 91 =
  40. 40.Double 65 =

Answer key

  1. 78
  2. 154
  3. 36
  4. 34
  5. 188
  6. 32
  7. 94
  8. 104
  9. 99
  10. 14
  11. 48
  12. 184
  13. 122
  14. 70
  15. 91
  16. 42
  17. 82
  18. 86
  19. 52
  20. 56
  21. 72
  22. 35
  23. 34
  24. 196
  25. 64
  26. 17
  27. 59
  28. 102
  29. 114
  30. 50
  31. 44
  32. 20
  33. 62
  34. 77
  35. 124
  36. 58
  37. 36
  38. 190
  39. 182
  40. 130

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