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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 307 · 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. 1.68² =
  2. 2.86² =
  3. 3.85² =
  4. 4.66² =
  5. 5.61² =
  6. 6.34² =
  7. 7.89² =
  8. 8.51² =
  9. 9.38² =
  10. 10.42² =
  11. 11.72² =
  12. 12.31² =
  13. 13.92² =
  14. 14.54² =
  15. 15.74² =
  16. 16.48² =
  17. 17.55² =
  18. 18.62² =
  19. 19.79² =
  20. 20.46² =
  21. 21.35² =
  22. 22.41² =
  23. 23.64² =
  24. 24.94² =
  25. 25.83² =
  26. 26.81² =
  27. 27.49² =
  28. 28.91² =
  29. 29.32² =
  30. 30.71² =
  31. 31.37² =
  32. 32.39² =
  33. 33.75² =
  34. 34.88² =
  35. 35.93² =
  36. 36.84² =
  37. 37.95² =
  38. 38.99² =
  39. 39.59² =
  40. 40.47² =

Answer key

  1. 4624
  2. 7396
  3. 7225
  4. 4356
  5. 3721
  6. 1156
  7. 7921
  8. 2601
  9. 1444
  10. 1764
  11. 5184
  12. 961
  13. 8464
  14. 2916
  15. 5476
  16. 2304
  17. 3025
  18. 3844
  19. 6241
  20. 2116
  21. 1225
  22. 1681
  23. 4096
  24. 8836
  25. 6889
  26. 6561
  27. 2401
  28. 8281
  29. 1024
  30. 5041
  31. 1369
  32. 1521
  33. 5625
  34. 7744
  35. 8649
  36. 7056
  37. 9025
  38. 9801
  39. 3481
  40. 2209

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