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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 553 · 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 102 =
  2. 2.Half of 118 =
  3. 3.Double 99 =
  4. 4.Double 57 =
  5. 5.Half of 62 =
  6. 6.Double 32 =
  7. 7.Double 51 =
  8. 8.Double 21 =
  9. 9.Double 41 =
  10. 10.Half of 128 =
  11. 11.Half of 190 =
  12. 12.Double 69 =
  13. 13.Double 91 =
  14. 14.Half of 72 =
  15. 15.Double 67 =
  16. 16.Double 68 =
  17. 17.Double 31 =
  18. 18.Double 66 =
  19. 19.Double 55 =
  20. 20.Half of 94 =
  21. 21.Half of 76 =
  22. 22.Double 18 =
  23. 23.Half of 56 =
  24. 24.Half of 48 =
  25. 25.Double 93 =
  26. 26.Double 49 =
  27. 27.Half of 194 =
  28. 28.Double 98 =
  29. 29.Double 72 =
  30. 30.Double 26 =
  31. 31.Half of 80 =
  32. 32.Half of 162 =
  33. 33.Half of 136 =
  34. 34.Half of 148 =
  35. 35.Half of 198 =
  36. 36.Double 35 =
  37. 37.Double 25 =
  38. 38.Double 28 =
  39. 39.Double 61 =
  40. 40.Double 17 =

Answer key

  1. 51
  2. 59
  3. 198
  4. 114
  5. 31
  6. 64
  7. 102
  8. 42
  9. 82
  10. 64
  11. 95
  12. 138
  13. 182
  14. 36
  15. 134
  16. 136
  17. 62
  18. 132
  19. 110
  20. 47
  21. 38
  22. 36
  23. 28
  24. 24
  25. 186
  26. 98
  27. 97
  28. 196
  29. 144
  30. 52
  31. 40
  32. 81
  33. 68
  34. 74
  35. 99
  36. 70
  37. 50
  38. 56
  39. 122
  40. 34

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