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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 266 · 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. 1.34² =
  2. 2.78² =
  3. 3.93² =
  4. 4.85² =
  5. 5.35² =
  6. 6.99² =
  7. 7.73² =
  8. 8.31² =
  9. 9.43² =
  10. 10.82² =
  11. 11.61² =
  12. 12.51² =
  13. 13.56² =
  14. 14.71² =
  15. 15.79² =
  16. 16.46² =
  17. 17.63² =
  18. 18.64² =
  19. 19.94² =
  20. 20.58² =
  21. 21.57² =
  22. 22.92² =
  23. 23.84² =
  24. 24.75² =
  25. 25.74² =
  26. 26.39² =
  27. 27.86² =
  28. 28.37² =
  29. 29.66² =
  30. 30.69² =
  31. 31.68² =
  32. 32.32² =
  33. 33.81² =
  34. 34.33² =
  35. 35.65² =
  36. 36.45² =
  37. 37.48² =
  38. 38.89² =
  39. 39.59² =
  40. 40.83² =

Answer key

  1. 1156
  2. 6084
  3. 8649
  4. 7225
  5. 1225
  6. 9801
  7. 5329
  8. 961
  9. 1849
  10. 6724
  11. 3721
  12. 2601
  13. 3136
  14. 5041
  15. 6241
  16. 2116
  17. 3969
  18. 4096
  19. 8836
  20. 3364
  21. 3249
  22. 8464
  23. 7056
  24. 5625
  25. 5476
  26. 1521
  27. 7396
  28. 1369
  29. 4356
  30. 4761
  31. 4624
  32. 1024
  33. 6561
  34. 1089
  35. 4225
  36. 2025
  37. 2304
  38. 7921
  39. 3481
  40. 6889

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