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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 371 · 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. 1.92² =
  2. 2.37² =
  3. 3.48² =
  4. 4.41² =
  5. 5.38² =
  6. 6.65² =
  7. 7.53² =
  8. 8.58² =
  9. 9.85² =
  10. 10.45² =
  11. 11.44² =
  12. 12.74² =
  13. 13.32² =
  14. 14.97² =
  15. 15.99² =
  16. 16.83² =
  17. 17.57² =
  18. 18.31² =
  19. 19.61² =
  20. 20.34² =
  21. 21.93² =
  22. 22.67² =
  23. 23.86² =
  24. 24.52² =
  25. 25.75² =
  26. 26.81² =
  27. 27.79² =
  28. 28.89² =
  29. 29.64² =
  30. 30.68² =
  31. 31.47² =
  32. 32.91² =
  33. 33.73² =
  34. 34.35² =
  35. 35.71² =
  36. 36.69² =
  37. 37.56² =
  38. 38.33² =
  39. 39.98² =
  40. 40.36² =

Answer key

  1. 8464
  2. 1369
  3. 2304
  4. 1681
  5. 1444
  6. 4225
  7. 2809
  8. 3364
  9. 7225
  10. 2025
  11. 1936
  12. 5476
  13. 1024
  14. 9409
  15. 9801
  16. 6889
  17. 3249
  18. 961
  19. 3721
  20. 1156
  21. 8649
  22. 4489
  23. 7396
  24. 2704
  25. 5625
  26. 6561
  27. 6241
  28. 7921
  29. 4096
  30. 4624
  31. 2209
  32. 8281
  33. 5329
  34. 1225
  35. 5041
  36. 4761
  37. 3136
  38. 1089
  39. 9604
  40. 1296

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