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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 998 · 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 154 =
  2. 2.Half of 30 =
  3. 3.Double 97 =
  4. 4.Half of 124 =
  5. 5.Double 71 =
  6. 6.Double 79 =
  7. 7.Half of 78 =
  8. 8.Double 64 =
  9. 9.Double 92 =
  10. 10.Double 86 =
  11. 11.Double 85 =
  12. 12.Double 62 =
  13. 13.Half of 132 =
  14. 14.Double 32 =
  15. 15.Half of 148 =
  16. 16.Double 96 =
  17. 17.Double 75 =
  18. 18.Half of 150 =
  19. 19.Double 23 =
  20. 20.Half of 118 =
  21. 21.Double 58 =
  22. 22.Half of 182 =
  23. 23.Half of 170 =
  24. 24.Double 38 =
  25. 25.Half of 186 =
  26. 26.Double 17 =
  27. 27.Half of 70 =
  28. 28.Half of 198 =
  29. 29.Half of 58 =
  30. 30.Half of 52 =
  31. 31.Double 56 =
  32. 32.Double 24 =
  33. 33.Double 35 =
  34. 34.Double 29 =
  35. 35.Double 81 =
  36. 36.Half of 76 =
  37. 37.Half of 158 =
  38. 38.Double 91 =
  39. 39.Half of 178 =
  40. 40.Double 74 =

Answer key

  1. 77
  2. 15
  3. 194
  4. 62
  5. 142
  6. 158
  7. 39
  8. 128
  9. 184
  10. 172
  11. 170
  12. 124
  13. 66
  14. 64
  15. 74
  16. 192
  17. 150
  18. 75
  19. 46
  20. 59
  21. 116
  22. 91
  23. 85
  24. 76
  25. 93
  26. 34
  27. 35
  28. 99
  29. 29
  30. 26
  31. 112
  32. 48
  33. 70
  34. 58
  35. 162
  36. 38
  37. 79
  38. 182
  39. 89
  40. 148

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