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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 34 · 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. 1.83² =
  2. 2.51² =
  3. 3.57² =
  4. 4.48² =
  5. 5.82² =
  6. 6.34² =
  7. 7.95² =
  8. 8.49² =
  9. 9.32² =
  10. 10.46² =
  11. 11.36² =
  12. 12.66² =
  13. 13.62² =
  14. 14.99² =
  15. 15.71² =
  16. 16.44² =
  17. 17.79² =
  18. 18.72² =
  19. 19.59² =
  20. 20.92² =
  21. 21.97² =
  22. 22.41² =
  23. 23.43² =
  24. 24.64² =
  25. 25.63² =
  26. 26.89² =
  27. 27.76² =
  28. 28.85² =
  29. 29.81² =
  30. 30.38² =
  31. 31.87² =
  32. 32.74² =
  33. 33.33² =
  34. 34.91² =
  35. 35.77² =
  36. 36.58² =
  37. 37.39² =
  38. 38.61² =
  39. 39.37² =
  40. 40.93² =

Answer key

  1. 6889
  2. 2601
  3. 3249
  4. 2304
  5. 6724
  6. 1156
  7. 9025
  8. 2401
  9. 1024
  10. 2116
  11. 1296
  12. 4356
  13. 3844
  14. 9801
  15. 5041
  16. 1936
  17. 6241
  18. 5184
  19. 3481
  20. 8464
  21. 9409
  22. 1681
  23. 1849
  24. 4096
  25. 3969
  26. 7921
  27. 5776
  28. 7225
  29. 6561
  30. 1444
  31. 7569
  32. 5476
  33. 1089
  34. 8281
  35. 5929
  36. 3364
  37. 1521
  38. 3721
  39. 1369
  40. 8649

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