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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 102 · 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 64 =
  2. 2.Half of 152 =
  3. 3.Double 62 =
  4. 4.Half of 136 =
  5. 5.Half of 176 =
  6. 6.Half of 184 =
  7. 7.Double 19 =
  8. 8.Half of 170 =
  9. 9.Half of 68 =
  10. 10.Double 84 =
  11. 11.Double 92 =
  12. 12.Double 29 =
  13. 13.Double 41 =
  14. 14.Double 35 =
  15. 15.Double 97 =
  16. 16.Double 76 =
  17. 17.Half of 188 =
  18. 18.Double 23 =
  19. 19.Half of 40 =
  20. 20.Half of 198 =
  21. 21.Half of 96 =
  22. 22.Half of 148 =
  23. 23.Double 22 =
  24. 24.Double 98 =
  25. 25.Half of 38 =
  26. 26.Half of 98 =
  27. 27.Half of 154 =
  28. 28.Half of 76 =
  29. 29.Double 58 =
  30. 30.Double 21 =
  31. 31.Half of 56 =
  32. 32.Double 27 =
  33. 33.Double 26 =
  34. 34.Half of 74 =
  35. 35.Double 78 =
  36. 36.Double 25 =
  37. 37.Half of 114 =
  38. 38.Double 52 =
  39. 39.Double 43 =
  40. 40.Double 83 =

Answer key

  1. 128
  2. 76
  3. 124
  4. 68
  5. 88
  6. 92
  7. 38
  8. 85
  9. 34
  10. 168
  11. 184
  12. 58
  13. 82
  14. 70
  15. 194
  16. 152
  17. 94
  18. 46
  19. 20
  20. 99
  21. 48
  22. 74
  23. 44
  24. 196
  25. 19
  26. 49
  27. 77
  28. 38
  29. 116
  30. 42
  31. 28
  32. 54
  33. 52
  34. 37
  35. 156
  36. 50
  37. 57
  38. 104
  39. 86
  40. 166

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