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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 805 · 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. 1.86² =
  2. 2.38² =
  3. 3.43² =
  4. 4.34² =
  5. 5.65² =
  6. 6.32² =
  7. 7.94² =
  8. 8.69² =
  9. 9.91² =
  10. 10.92² =
  11. 11.81² =
  12. 12.56² =
  13. 13.44² =
  14. 14.95² =
  15. 15.71² =
  16. 16.48² =
  17. 17.79² =
  18. 18.46² =
  19. 19.75² =
  20. 20.41² =
  21. 21.39² =
  22. 22.42² =
  23. 23.52² =
  24. 24.96² =
  25. 25.83² =
  26. 26.72² =
  27. 27.51² =
  28. 28.84² =
  29. 29.74² =
  30. 30.45² =
  31. 31.61² =
  32. 32.33² =
  33. 33.99² =
  34. 34.88² =
  35. 35.58² =
  36. 36.87² =
  37. 37.54² =
  38. 38.55² =
  39. 39.59² =
  40. 40.47² =

Answer key

  1. 7396
  2. 1444
  3. 1849
  4. 1156
  5. 4225
  6. 1024
  7. 8836
  8. 4761
  9. 8281
  10. 8464
  11. 6561
  12. 3136
  13. 1936
  14. 9025
  15. 5041
  16. 2304
  17. 6241
  18. 2116
  19. 5625
  20. 1681
  21. 1521
  22. 1764
  23. 2704
  24. 9216
  25. 6889
  26. 5184
  27. 2601
  28. 7056
  29. 5476
  30. 2025
  31. 3721
  32. 1089
  33. 9801
  34. 7744
  35. 3364
  36. 7569
  37. 2916
  38. 3025
  39. 3481
  40. 2209

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