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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 635 · 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. 1.71² =
  2. 2.49² =
  3. 3.85² =
  4. 4.91² =
  5. 5.81² =
  6. 6.36² =
  7. 7.61² =
  8. 8.92² =
  9. 9.41² =
  10. 10.48² =
  11. 11.34² =
  12. 12.82² =
  13. 13.68² =
  14. 14.39² =
  15. 15.43² =
  16. 16.52² =
  17. 17.44² =
  18. 18.94² =
  19. 19.62² =
  20. 20.56² =
  21. 21.84² =
  22. 22.99² =
  23. 23.69² =
  24. 24.42² =
  25. 25.89² =
  26. 26.79² =
  27. 27.86² =
  28. 28.95² =
  29. 29.65² =
  30. 30.45² =
  31. 31.35² =
  32. 32.96² =
  33. 33.38² =
  34. 34.77² =
  35. 35.98² =
  36. 36.51² =
  37. 37.59² =
  38. 38.33² =
  39. 39.46² =
  40. 40.67² =

Answer key

  1. 5041
  2. 2401
  3. 7225
  4. 8281
  5. 6561
  6. 1296
  7. 3721
  8. 8464
  9. 1681
  10. 2304
  11. 1156
  12. 6724
  13. 4624
  14. 1521
  15. 1849
  16. 2704
  17. 1936
  18. 8836
  19. 3844
  20. 3136
  21. 7056
  22. 9801
  23. 4761
  24. 1764
  25. 7921
  26. 6241
  27. 7396
  28. 9025
  29. 4225
  30. 2025
  31. 1225
  32. 9216
  33. 1444
  34. 5929
  35. 9604
  36. 2601
  37. 3481
  38. 1089
  39. 2116
  40. 4489

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