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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 505 · 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. 1.93² =
  2. 2.47² =
  3. 3.41² =
  4. 4.61² =
  5. 5.81² =
  6. 6.42² =
  7. 7.64² =
  8. 8.97² =
  9. 9.92² =
  10. 10.71² =
  11. 11.33² =
  12. 12.78² =
  13. 13.91² =
  14. 14.31² =
  15. 15.79² =
  16. 16.37² =
  17. 17.98² =
  18. 18.77² =
  19. 19.39² =
  20. 20.56² =
  21. 21.99² =
  22. 22.84² =
  23. 23.55² =
  24. 24.89² =
  25. 25.95² =
  26. 26.48² =
  27. 27.86² =
  28. 28.44² =
  29. 29.34² =
  30. 30.36² =
  31. 31.73² =
  32. 32.46² =
  33. 33.96² =
  34. 34.51² =
  35. 35.85² =
  36. 36.94² =
  37. 37.43² =
  38. 38.52² =
  39. 39.68² =
  40. 40.58² =

Answer key

  1. 8649
  2. 2209
  3. 1681
  4. 3721
  5. 6561
  6. 1764
  7. 4096
  8. 9409
  9. 8464
  10. 5041
  11. 1089
  12. 6084
  13. 8281
  14. 961
  15. 6241
  16. 1369
  17. 9604
  18. 5929
  19. 1521
  20. 3136
  21. 9801
  22. 7056
  23. 3025
  24. 7921
  25. 9025
  26. 2304
  27. 7396
  28. 1936
  29. 1156
  30. 1296
  31. 5329
  32. 2116
  33. 9216
  34. 2601
  35. 7225
  36. 8836
  37. 1849
  38. 2704
  39. 4624
  40. 3364

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