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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 199 · 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. 1.44² =
  2. 2.71² =
  3. 3.83² =
  4. 4.78² =
  5. 5.53² =
  6. 6.66² =
  7. 7.75² =
  8. 8.63² =
  9. 9.57² =
  10. 10.76² =
  11. 11.67² =
  12. 12.86² =
  13. 13.46² =
  14. 14.85² =
  15. 15.79² =
  16. 16.32² =
  17. 17.52² =
  18. 18.82² =
  19. 19.59² =
  20. 20.77² =
  21. 21.37² =
  22. 22.41² =
  23. 23.96² =
  24. 24.89² =
  25. 25.42² =
  26. 26.69² =
  27. 27.95² =
  28. 28.47² =
  29. 29.81² =
  30. 30.68² =
  31. 31.73² =
  32. 32.35² =
  33. 33.33² =
  34. 34.84² =
  35. 35.55² =
  36. 36.31² =
  37. 37.45² =
  38. 38.36² =
  39. 39.74² =
  40. 40.62² =

Answer key

  1. 1936
  2. 5041
  3. 6889
  4. 6084
  5. 2809
  6. 4356
  7. 5625
  8. 3969
  9. 3249
  10. 5776
  11. 4489
  12. 7396
  13. 2116
  14. 7225
  15. 6241
  16. 1024
  17. 2704
  18. 6724
  19. 3481
  20. 5929
  21. 1369
  22. 1681
  23. 9216
  24. 7921
  25. 1764
  26. 4761
  27. 9025
  28. 2209
  29. 6561
  30. 4624
  31. 5329
  32. 1225
  33. 1089
  34. 7056
  35. 3025
  36. 961
  37. 2025
  38. 1296
  39. 5476
  40. 3844

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