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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 421 · 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. 1.95² =
  2. 2.63² =
  3. 3.48² =
  4. 4.86² =
  5. 5.43² =
  6. 6.56² =
  7. 7.69² =
  8. 8.96² =
  9. 9.36² =
  10. 10.37² =
  11. 11.31² =
  12. 12.75² =
  13. 13.71² =
  14. 14.76² =
  15. 15.99² =
  16. 16.64² =
  17. 17.81² =
  18. 18.61² =
  19. 19.98² =
  20. 20.91² =
  21. 21.46² =
  22. 22.72² =
  23. 23.67² =
  24. 24.52² =
  25. 25.44² =
  26. 26.35² =
  27. 27.42² =
  28. 28.41² =
  29. 29.94² =
  30. 30.57² =
  31. 31.68² =
  32. 32.51² =
  33. 33.85² =
  34. 34.62² =
  35. 35.55² =
  36. 36.38² =
  37. 37.34² =
  38. 38.49² =
  39. 39.93² =
  40. 40.88² =

Answer key

  1. 9025
  2. 3969
  3. 2304
  4. 7396
  5. 1849
  6. 3136
  7. 4761
  8. 9216
  9. 1296
  10. 1369
  11. 961
  12. 5625
  13. 5041
  14. 5776
  15. 9801
  16. 4096
  17. 6561
  18. 3721
  19. 9604
  20. 8281
  21. 2116
  22. 5184
  23. 4489
  24. 2704
  25. 1936
  26. 1225
  27. 1764
  28. 1681
  29. 8836
  30. 3249
  31. 4624
  32. 2601
  33. 7225
  34. 3844
  35. 3025
  36. 1444
  37. 1156
  38. 2401
  39. 8649
  40. 7744

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