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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 832 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.35² =
  2. 2.96² =
  3. 3.38² =
  4. 4.34² =
  5. 5.54² =
  6. 6.97² =
  7. 7.71² =
  8. 8.64² =
  9. 9.52² =
  10. 10.51² =
  11. 11.49² =
  12. 12.48² =
  13. 13.62² =
  14. 14.42² =
  15. 15.75² =
  16. 16.59² =
  17. 17.72² =
  18. 18.58² =
  19. 19.41² =
  20. 20.45² =
  21. 21.39² =
  22. 22.47² =
  23. 23.36² =
  24. 24.74² =
  25. 25.61² =
  26. 26.95² =
  27. 27.99² =
  28. 28.79² =
  29. 29.92² =
  30. 30.82² =
  31. 31.44² =
  32. 32.31² =
  33. 33.83² =
  34. 34.81² =
  35. 35.32² =
  36. 36.76² =
  37. 37.65² =
  38. 38.69² =
  39. 39.33² =
  40. 40.66² =

Answer key

  1. 1225
  2. 9216
  3. 1444
  4. 1156
  5. 2916
  6. 9409
  7. 5041
  8. 4096
  9. 2704
  10. 2601
  11. 2401
  12. 2304
  13. 3844
  14. 1764
  15. 5625
  16. 3481
  17. 5184
  18. 3364
  19. 1681
  20. 2025
  21. 1521
  22. 2209
  23. 1296
  24. 5476
  25. 3721
  26. 9025
  27. 9801
  28. 6241
  29. 8464
  30. 6724
  31. 1936
  32. 961
  33. 6889
  34. 6561
  35. 1024
  36. 5776
  37. 4225
  38. 4761
  39. 1089
  40. 4356

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