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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 351 · 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 58 =
  2. 2.Double 45 =
  3. 3.Double 56 =
  4. 4.Double 71 =
  5. 5.Half of 194 =
  6. 6.Double 51 =
  7. 7.Double 65 =
  8. 8.Double 46 =
  9. 9.Half of 158 =
  10. 10.Half of 154 =
  11. 11.Double 22 =
  12. 12.Half of 62 =
  13. 13.Double 93 =
  14. 14.Double 91 =
  15. 15.Half of 144 =
  16. 16.Half of 52 =
  17. 17.Double 48 =
  18. 18.Half of 152 =
  19. 19.Double 88 =
  20. 20.Half of 112 =
  21. 21.Half of 134 =
  22. 22.Half of 124 =
  23. 23.Double 59 =
  24. 24.Half of 94 =
  25. 25.Double 96 =
  26. 26.Double 72 =
  27. 27.Double 21 =
  28. 28.Double 89 =
  29. 29.Double 75 =
  30. 30.Half of 74 =
  31. 31.Double 49 =
  32. 32.Half of 44 =
  33. 33.Half of 136 =
  34. 34.Half of 198 =
  35. 35.Half of 106 =
  36. 36.Half of 114 =
  37. 37.Double 31 =
  38. 38.Double 78 =
  39. 39.Half of 86 =
  40. 40.Half of 72 =

Answer key

  1. 116
  2. 90
  3. 112
  4. 142
  5. 97
  6. 102
  7. 130
  8. 92
  9. 79
  10. 77
  11. 44
  12. 31
  13. 186
  14. 182
  15. 72
  16. 26
  17. 96
  18. 76
  19. 176
  20. 56
  21. 67
  22. 62
  23. 118
  24. 47
  25. 192
  26. 144
  27. 42
  28. 178
  29. 150
  30. 37
  31. 98
  32. 22
  33. 68
  34. 99
  35. 53
  36. 57
  37. 62
  38. 156
  39. 43
  40. 36

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