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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 604 · 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. 1.66² =
  2. 2.89² =
  3. 3.75² =
  4. 4.38² =
  5. 5.74² =
  6. 6.43² =
  7. 7.47² =
  8. 8.61² =
  9. 9.37² =
  10. 10.48² =
  11. 11.82² =
  12. 12.87² =
  13. 13.32² =
  14. 14.93² =
  15. 15.39² =
  16. 16.33² =
  17. 17.81² =
  18. 18.55² =
  19. 19.34² =
  20. 20.71² =
  21. 21.31² =
  22. 22.68² =
  23. 23.51² =
  24. 24.94² =
  25. 25.64² =
  26. 26.54² =
  27. 27.58² =
  28. 28.98² =
  29. 29.57² =
  30. 30.42² =
  31. 31.77² =
  32. 32.44² =
  33. 33.36² =
  34. 34.46² =
  35. 35.65² =
  36. 36.69² =
  37. 37.73² =
  38. 38.96² =
  39. 39.79² =
  40. 40.92² =

Answer key

  1. 4356
  2. 7921
  3. 5625
  4. 1444
  5. 5476
  6. 1849
  7. 2209
  8. 3721
  9. 1369
  10. 2304
  11. 6724
  12. 7569
  13. 1024
  14. 8649
  15. 1521
  16. 1089
  17. 6561
  18. 3025
  19. 1156
  20. 5041
  21. 961
  22. 4624
  23. 2601
  24. 8836
  25. 4096
  26. 2916
  27. 3364
  28. 9604
  29. 3249
  30. 1764
  31. 5929
  32. 1936
  33. 1296
  34. 2116
  35. 4225
  36. 4761
  37. 5329
  38. 9216
  39. 6241
  40. 8464

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