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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 770 · 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. 1.56² =
  2. 2.81² =
  3. 3.49² =
  4. 4.98² =
  5. 5.46² =
  6. 6.31² =
  7. 7.78² =
  8. 8.47² =
  9. 9.96² =
  10. 10.64² =
  11. 11.51² =
  12. 12.76² =
  13. 13.86² =
  14. 14.82² =
  15. 15.87² =
  16. 16.66² =
  17. 17.55² =
  18. 18.91² =
  19. 19.92² =
  20. 20.73² =
  21. 21.75² =
  22. 22.43² =
  23. 23.44² =
  24. 24.37² =
  25. 25.61² =
  26. 26.41² =
  27. 27.67² =
  28. 28.74² =
  29. 29.88² =
  30. 30.71² =
  31. 31.83² =
  32. 32.48² =
  33. 33.77² =
  34. 34.34² =
  35. 35.32² =
  36. 36.33² =
  37. 37.85² =
  38. 38.59² =
  39. 39.99² =
  40. 40.38² =

Answer key

  1. 3136
  2. 6561
  3. 2401
  4. 9604
  5. 2116
  6. 961
  7. 6084
  8. 2209
  9. 9216
  10. 4096
  11. 2601
  12. 5776
  13. 7396
  14. 6724
  15. 7569
  16. 4356
  17. 3025
  18. 8281
  19. 8464
  20. 5329
  21. 5625
  22. 1849
  23. 1936
  24. 1369
  25. 3721
  26. 1681
  27. 4489
  28. 5476
  29. 7744
  30. 5041
  31. 6889
  32. 2304
  33. 5929
  34. 1156
  35. 1024
  36. 1089
  37. 7225
  38. 3481
  39. 9801
  40. 1444

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