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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 606 · 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. 1.66² =
  2. 2.51² =
  3. 3.54² =
  4. 4.32² =
  5. 5.43² =
  6. 6.77² =
  7. 7.36² =
  8. 8.53² =
  9. 9.48² =
  10. 10.95² =
  11. 11.37² =
  12. 12.31² =
  13. 13.35² =
  14. 14.72² =
  15. 15.61² =
  16. 16.52² =
  17. 17.86² =
  18. 18.64² =
  19. 19.83² =
  20. 20.71² =
  21. 21.73² =
  22. 22.42² =
  23. 23.78² =
  24. 24.89² =
  25. 25.49² =
  26. 26.41² =
  27. 27.96² =
  28. 28.34² =
  29. 29.92² =
  30. 30.55² =
  31. 31.81² =
  32. 32.87² =
  33. 33.46² =
  34. 34.79² =
  35. 35.63² =
  36. 36.97² =
  37. 37.99² =
  38. 38.74² =
  39. 39.58² =
  40. 40.84² =

Answer key

  1. 4356
  2. 2601
  3. 2916
  4. 1024
  5. 1849
  6. 5929
  7. 1296
  8. 2809
  9. 2304
  10. 9025
  11. 1369
  12. 961
  13. 1225
  14. 5184
  15. 3721
  16. 2704
  17. 7396
  18. 4096
  19. 6889
  20. 5041
  21. 5329
  22. 1764
  23. 6084
  24. 7921
  25. 2401
  26. 1681
  27. 9216
  28. 1156
  29. 8464
  30. 3025
  31. 6561
  32. 7569
  33. 2116
  34. 6241
  35. 3969
  36. 9409
  37. 9801
  38. 5476
  39. 3364
  40. 7056

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