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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 103 · 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. 1.72² =
  2. 2.92² =
  3. 3.96² =
  4. 4.71² =
  5. 5.49² =
  6. 6.91² =
  7. 7.34² =
  8. 8.55² =
  9. 9.75² =
  10. 10.76² =
  11. 11.98² =
  12. 12.61² =
  13. 13.43² =
  14. 14.59² =
  15. 15.97² =
  16. 16.83² =
  17. 17.99² =
  18. 18.33² =
  19. 19.52² =
  20. 20.81² =
  21. 21.84² =
  22. 22.32² =
  23. 23.64² =
  24. 24.51² =
  25. 25.67² =
  26. 26.31² =
  27. 27.41² =
  28. 28.62² =
  29. 29.58² =
  30. 30.45² =
  31. 31.66² =
  32. 32.85² =
  33. 33.57² =
  34. 34.63² =
  35. 35.42² =
  36. 36.37² =
  37. 37.46² =
  38. 38.65² =
  39. 39.48² =
  40. 40.38² =

Answer key

  1. 5184
  2. 8464
  3. 9216
  4. 5041
  5. 2401
  6. 8281
  7. 1156
  8. 3025
  9. 5625
  10. 5776
  11. 9604
  12. 3721
  13. 1849
  14. 3481
  15. 9409
  16. 6889
  17. 9801
  18. 1089
  19. 2704
  20. 6561
  21. 7056
  22. 1024
  23. 4096
  24. 2601
  25. 4489
  26. 961
  27. 1681
  28. 3844
  29. 3364
  30. 2025
  31. 4356
  32. 7225
  33. 3249
  34. 3969
  35. 1764
  36. 1369
  37. 2116
  38. 4225
  39. 2304
  40. 1444

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