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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 137 · 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. 1.83² =
  2. 2.88² =
  3. 3.53² =
  4. 4.36² =
  5. 5.55² =
  6. 6.91² =
  7. 7.89² =
  8. 8.39² =
  9. 9.61² =
  10. 10.96² =
  11. 11.64² =
  12. 12.68² =
  13. 13.84² =
  14. 14.46² =
  15. 15.79² =
  16. 16.62² =
  17. 17.97² =
  18. 18.73² =
  19. 19.87² =
  20. 20.44² =
  21. 21.32² =
  22. 22.92² =
  23. 23.98² =
  24. 24.82² =
  25. 25.35² =
  26. 26.54² =
  27. 27.43² =
  28. 28.76² =
  29. 29.69² =
  30. 30.34² =
  31. 31.59² =
  32. 32.81² =
  33. 33.65² =
  34. 34.72² =
  35. 35.33² =
  36. 36.48² =
  37. 37.41² =
  38. 38.75² =
  39. 39.51² =
  40. 40.74² =

Answer key

  1. 6889
  2. 7744
  3. 2809
  4. 1296
  5. 3025
  6. 8281
  7. 7921
  8. 1521
  9. 3721
  10. 9216
  11. 4096
  12. 4624
  13. 7056
  14. 2116
  15. 6241
  16. 3844
  17. 9409
  18. 5329
  19. 7569
  20. 1936
  21. 1024
  22. 8464
  23. 9604
  24. 6724
  25. 1225
  26. 2916
  27. 1849
  28. 5776
  29. 4761
  30. 1156
  31. 3481
  32. 6561
  33. 4225
  34. 5184
  35. 1089
  36. 2304
  37. 1681
  38. 5625
  39. 2601
  40. 5476

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