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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 204 · 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. 1.36² =
  2. 2.96² =
  3. 3.79² =
  4. 4.31² =
  5. 5.38² =
  6. 6.75² =
  7. 7.56² =
  8. 8.71² =
  9. 9.42² =
  10. 10.41² =
  11. 11.67² =
  12. 12.46² =
  13. 13.92² =
  14. 14.44² =
  15. 15.55² =
  16. 16.89² =
  17. 17.62² =
  18. 18.61² =
  19. 19.48² =
  20. 20.93² =
  21. 21.87² =
  22. 22.33² =
  23. 23.53² =
  24. 24.81² =
  25. 25.72² =
  26. 26.52² =
  27. 27.99² =
  28. 28.76² =
  29. 29.34² =
  30. 30.47² =
  31. 31.85² =
  32. 32.82² =
  33. 33.73² =
  34. 34.51² =
  35. 35.91² =
  36. 36.45² =
  37. 37.49² =
  38. 38.83² =
  39. 39.37² =
  40. 40.95² =

Answer key

  1. 1296
  2. 9216
  3. 6241
  4. 961
  5. 1444
  6. 5625
  7. 3136
  8. 5041
  9. 1764
  10. 1681
  11. 4489
  12. 2116
  13. 8464
  14. 1936
  15. 3025
  16. 7921
  17. 3844
  18. 3721
  19. 2304
  20. 8649
  21. 7569
  22. 1089
  23. 2809
  24. 6561
  25. 5184
  26. 2704
  27. 9801
  28. 5776
  29. 1156
  30. 2209
  31. 7225
  32. 6724
  33. 5329
  34. 2601
  35. 8281
  36. 2025
  37. 2401
  38. 6889
  39. 1369
  40. 9025

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