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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 122 · 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. 1.71² =
  2. 2.38² =
  3. 3.42² =
  4. 4.75² =
  5. 5.66² =
  6. 6.82² =
  7. 7.79² =
  8. 8.91² =
  9. 9.33² =
  10. 10.37² =
  11. 11.44² =
  12. 12.35² =
  13. 13.63² =
  14. 14.74² =
  15. 15.65² =
  16. 16.94² =
  17. 17.47² =
  18. 18.48² =
  19. 19.32² =
  20. 20.86² =
  21. 21.85² =
  22. 22.73² =
  23. 23.93² =
  24. 24.88² =
  25. 25.83² =
  26. 26.61² =
  27. 27.81² =
  28. 28.46² =
  29. 29.43² =
  30. 30.31² =
  31. 31.51² =
  32. 32.67² =
  33. 33.62² =
  34. 34.89² =
  35. 35.57² =
  36. 36.38² =
  37. 37.64² =
  38. 38.68² =
  39. 39.76² =
  40. 40.34² =

Answer key

  1. 5041
  2. 1444
  3. 1764
  4. 5625
  5. 4356
  6. 6724
  7. 6241
  8. 8281
  9. 1089
  10. 1369
  11. 1936
  12. 1225
  13. 3969
  14. 5476
  15. 4225
  16. 8836
  17. 2209
  18. 2304
  19. 1024
  20. 7396
  21. 7225
  22. 5329
  23. 8649
  24. 7744
  25. 6889
  26. 3721
  27. 6561
  28. 2116
  29. 1849
  30. 961
  31. 2601
  32. 4489
  33. 3844
  34. 7921
  35. 3249
  36. 1444
  37. 4096
  38. 4624
  39. 5776
  40. 1156

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