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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 754 · 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. 1.59² =
  2. 2.79² =
  3. 3.52² =
  4. 4.72² =
  5. 5.34² =
  6. 6.33² =
  7. 7.51² =
  8. 8.46² =
  9. 9.47² =
  10. 10.56² =
  11. 11.63² =
  12. 12.35² =
  13. 13.36² =
  14. 14.75² =
  15. 15.86² =
  16. 16.69² =
  17. 17.37² =
  18. 18.68² =
  19. 19.87² =
  20. 20.88² =
  21. 21.89² =
  22. 22.48² =
  23. 23.84² =
  24. 24.53² =
  25. 25.96² =
  26. 26.94² =
  27. 27.77² =
  28. 28.42² =
  29. 29.91² =
  30. 30.32² =
  31. 31.61² =
  32. 32.45² =
  33. 33.44² =
  34. 34.38² =
  35. 35.76² =
  36. 36.43² =
  37. 37.67² =
  38. 38.74² =
  39. 39.58² =
  40. 40.39² =

Answer key

  1. 3481
  2. 6241
  3. 2704
  4. 5184
  5. 1156
  6. 1089
  7. 2601
  8. 2116
  9. 2209
  10. 3136
  11. 3969
  12. 1225
  13. 1296
  14. 5625
  15. 7396
  16. 4761
  17. 1369
  18. 4624
  19. 7569
  20. 7744
  21. 7921
  22. 2304
  23. 7056
  24. 2809
  25. 9216
  26. 8836
  27. 5929
  28. 1764
  29. 8281
  30. 1024
  31. 3721
  32. 2025
  33. 1936
  34. 1444
  35. 5776
  36. 1849
  37. 4489
  38. 5476
  39. 3364
  40. 1521

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