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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 345 · 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. 1.35² =
  2. 2.87² =
  3. 3.41² =
  4. 4.66² =
  5. 5.48² =
  6. 6.81² =
  7. 7.37² =
  8. 8.97² =
  9. 9.38² =
  10. 10.63² =
  11. 11.83² =
  12. 12.46² =
  13. 13.53² =
  14. 14.75² =
  15. 15.68² =
  16. 16.45² =
  17. 17.42² =
  18. 18.78² =
  19. 19.96² =
  20. 20.69² =
  21. 21.73² =
  22. 22.89² =
  23. 23.31² =
  24. 24.72² =
  25. 25.52² =
  26. 26.44² =
  27. 27.74² =
  28. 28.49² =
  29. 29.86² =
  30. 30.64² =
  31. 31.92² =
  32. 32.93² =
  33. 33.57² =
  34. 34.98² =
  35. 35.88² =
  36. 36.51² =
  37. 37.34² =
  38. 38.79² =
  39. 39.82² =
  40. 40.61² =

Answer key

  1. 1225
  2. 7569
  3. 1681
  4. 4356
  5. 2304
  6. 6561
  7. 1369
  8. 9409
  9. 1444
  10. 3969
  11. 6889
  12. 2116
  13. 2809
  14. 5625
  15. 4624
  16. 2025
  17. 1764
  18. 6084
  19. 9216
  20. 4761
  21. 5329
  22. 7921
  23. 961
  24. 5184
  25. 2704
  26. 1936
  27. 5476
  28. 2401
  29. 7396
  30. 4096
  31. 8464
  32. 8649
  33. 3249
  34. 9604
  35. 7744
  36. 2601
  37. 1156
  38. 6241
  39. 6724
  40. 3721

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