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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 205 · 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. 1.46² =
  2. 2.87² =
  3. 3.83² =
  4. 4.54² =
  5. 5.37² =
  6. 6.48² =
  7. 7.39² =
  8. 8.51² =
  9. 9.76² =
  10. 10.88² =
  11. 11.91² =
  12. 12.77² =
  13. 13.61² =
  14. 14.81² =
  15. 15.86² =
  16. 16.47² =
  17. 17.82² =
  18. 18.68² =
  19. 19.62² =
  20. 20.84² =
  21. 21.95² =
  22. 22.73² =
  23. 23.89² =
  24. 24.71² =
  25. 25.55² =
  26. 26.42² =
  27. 27.38² =
  28. 28.33² =
  29. 29.99² =
  30. 30.35² =
  31. 31.52² =
  32. 32.31² =
  33. 33.96² =
  34. 34.63² =
  35. 35.74² =
  36. 36.43² =
  37. 37.59² =
  38. 38.69² =
  39. 39.53² =
  40. 40.65² =

Answer key

  1. 2116
  2. 7569
  3. 6889
  4. 2916
  5. 1369
  6. 2304
  7. 1521
  8. 2601
  9. 5776
  10. 7744
  11. 8281
  12. 5929
  13. 3721
  14. 6561
  15. 7396
  16. 2209
  17. 6724
  18. 4624
  19. 3844
  20. 7056
  21. 9025
  22. 5329
  23. 7921
  24. 5041
  25. 3025
  26. 1764
  27. 1444
  28. 1089
  29. 9801
  30. 1225
  31. 2704
  32. 961
  33. 9216
  34. 3969
  35. 5476
  36. 1849
  37. 3481
  38. 4761
  39. 2809
  40. 4225

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