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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 478 · 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. 1.61² =
  2. 2.55² =
  3. 3.46² =
  4. 4.41² =
  5. 5.81² =
  6. 6.91² =
  7. 7.38² =
  8. 8.67² =
  9. 9.77² =
  10. 10.58² =
  11. 11.93² =
  12. 12.76² =
  13. 13.71² =
  14. 14.52² =
  15. 15.51² =
  16. 16.85² =
  17. 17.94² =
  18. 18.47² =
  19. 19.37² =
  20. 20.96² =
  21. 21.36² =
  22. 22.57² =
  23. 23.69² =
  24. 24.83² =
  25. 25.45² =
  26. 26.59² =
  27. 27.54² =
  28. 28.42² =
  29. 29.92² =
  30. 30.33² =
  31. 31.89² =
  32. 32.84² =
  33. 33.88² =
  34. 34.34² =
  35. 35.79² =
  36. 36.39² =
  37. 37.53² =
  38. 38.72² =
  39. 39.87² =
  40. 40.75² =

Answer key

  1. 3721
  2. 3025
  3. 2116
  4. 1681
  5. 6561
  6. 8281
  7. 1444
  8. 4489
  9. 5929
  10. 3364
  11. 8649
  12. 5776
  13. 5041
  14. 2704
  15. 2601
  16. 7225
  17. 8836
  18. 2209
  19. 1369
  20. 9216
  21. 1296
  22. 3249
  23. 4761
  24. 6889
  25. 2025
  26. 3481
  27. 2916
  28. 1764
  29. 8464
  30. 1089
  31. 7921
  32. 7056
  33. 7744
  34. 1156
  35. 6241
  36. 1521
  37. 2809
  38. 5184
  39. 7569
  40. 5625

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