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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 736 · 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. 2.54² =
  3. 3.39² =
  4. 4.83² =
  5. 5.61² =
  6. 6.95² =
  7. 7.98² =
  8. 8.49² =
  9. 9.38² =
  10. 10.48² =
  11. 11.56² =
  12. 12.42² =
  13. 13.85² =
  14. 14.63² =
  15. 15.68² =
  16. 16.78² =
  17. 17.86² =
  18. 18.36² =
  19. 19.99² =
  20. 20.43² =
  21. 21.47² =
  22. 22.33² =
  23. 23.96² =
  24. 24.72² =
  25. 25.81² =
  26. 26.74² =
  27. 27.55² =
  28. 28.76² =
  29. 29.51² =
  30. 30.89² =
  31. 31.88² =
  32. 32.64² =
  33. 33.82² =
  34. 34.94² =
  35. 35.91² =
  36. 36.73² =
  37. 37.34² =
  38. 38.57² =
  39. 39.75² =
  40. 40.45² =

Answer key

  1. 5041
  2. 2916
  3. 1521
  4. 6889
  5. 3721
  6. 9025
  7. 9604
  8. 2401
  9. 1444
  10. 2304
  11. 3136
  12. 1764
  13. 7225
  14. 3969
  15. 4624
  16. 6084
  17. 7396
  18. 1296
  19. 9801
  20. 1849
  21. 2209
  22. 1089
  23. 9216
  24. 5184
  25. 6561
  26. 5476
  27. 3025
  28. 5776
  29. 2601
  30. 7921
  31. 7744
  32. 4096
  33. 6724
  34. 8836
  35. 8281
  36. 5329
  37. 1156
  38. 3249
  39. 5625
  40. 2025

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