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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 146 · 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. 1.61² =
  2. 2.44² =
  3. 3.35² =
  4. 4.69² =
  5. 5.66² =
  6. 6.97² =
  7. 7.99² =
  8. 8.68² =
  9. 9.83² =
  10. 10.39² =
  11. 11.93² =
  12. 12.43² =
  13. 13.73² =
  14. 14.47² =
  15. 15.91² =
  16. 16.56² =
  17. 17.72² =
  18. 18.31² =
  19. 19.81² =
  20. 20.74² =
  21. 21.96² =
  22. 22.38² =
  23. 23.49² =
  24. 24.75² =
  25. 25.37² =
  26. 26.36² =
  27. 27.63² =
  28. 28.86² =
  29. 29.59² =
  30. 30.71² =
  31. 31.42² =
  32. 32.78² =
  33. 33.33² =
  34. 34.85² =
  35. 35.53² =
  36. 36.67² =
  37. 37.51² =
  38. 38.46² =
  39. 39.89² =
  40. 40.34² =

Answer key

  1. 3721
  2. 1936
  3. 1225
  4. 4761
  5. 4356
  6. 9409
  7. 9801
  8. 4624
  9. 6889
  10. 1521
  11. 8649
  12. 1849
  13. 5329
  14. 2209
  15. 8281
  16. 3136
  17. 5184
  18. 961
  19. 6561
  20. 5476
  21. 9216
  22. 1444
  23. 2401
  24. 5625
  25. 1369
  26. 1296
  27. 3969
  28. 7396
  29. 3481
  30. 5041
  31. 1764
  32. 6084
  33. 1089
  34. 7225
  35. 2809
  36. 4489
  37. 2601
  38. 2116
  39. 7921
  40. 1156

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