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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 313 · 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. 1.46² =
  2. 2.53² =
  3. 3.43² =
  4. 4.57² =
  5. 5.99² =
  6. 6.83² =
  7. 7.93² =
  8. 8.98² =
  9. 9.61² =
  10. 10.94² =
  11. 11.32² =
  12. 12.75² =
  13. 13.64² =
  14. 14.38² =
  15. 15.62² =
  16. 16.55² =
  17. 17.44² =
  18. 18.39² =
  19. 19.52² =
  20. 20.86² =
  21. 21.85² =
  22. 22.88² =
  23. 23.51² =
  24. 24.54² =
  25. 25.48² =
  26. 26.71² =
  27. 27.68² =
  28. 28.56² =
  29. 29.37² =
  30. 30.76² =
  31. 31.74² =
  32. 32.77² =
  33. 33.84² =
  34. 34.45² =
  35. 35.91² =
  36. 36.47² =
  37. 37.41² =
  38. 38.33² =
  39. 39.97² =
  40. 40.81² =

Answer key

  1. 2116
  2. 2809
  3. 1849
  4. 3249
  5. 9801
  6. 6889
  7. 8649
  8. 9604
  9. 3721
  10. 8836
  11. 1024
  12. 5625
  13. 4096
  14. 1444
  15. 3844
  16. 3025
  17. 1936
  18. 1521
  19. 2704
  20. 7396
  21. 7225
  22. 7744
  23. 2601
  24. 2916
  25. 2304
  26. 5041
  27. 4624
  28. 3136
  29. 1369
  30. 5776
  31. 5476
  32. 5929
  33. 7056
  34. 2025
  35. 8281
  36. 2209
  37. 1681
  38. 1089
  39. 9409
  40. 6561

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