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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 277 · 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. 1.83² =
  2. 2.51² =
  3. 3.92² =
  4. 4.34² =
  5. 5.62² =
  6. 6.98² =
  7. 7.56² =
  8. 8.69² =
  9. 9.38² =
  10. 10.52² =
  11. 11.57² =
  12. 12.84² =
  13. 13.32² =
  14. 14.66² =
  15. 15.37² =
  16. 16.67² =
  17. 17.45² =
  18. 18.47² =
  19. 19.79² =
  20. 20.93² =
  21. 21.99² =
  22. 22.94² =
  23. 23.41² =
  24. 24.61² =
  25. 25.65² =
  26. 26.87² =
  27. 27.48² =
  28. 28.58² =
  29. 29.36² =
  30. 30.85² =
  31. 31.95² =
  32. 32.71² =
  33. 33.35² =
  34. 34.54² =
  35. 35.74² =
  36. 36.86² =
  37. 37.88² =
  38. 38.59² =
  39. 39.55² =
  40. 40.73² =

Answer key

  1. 6889
  2. 2601
  3. 8464
  4. 1156
  5. 3844
  6. 9604
  7. 3136
  8. 4761
  9. 1444
  10. 2704
  11. 3249
  12. 7056
  13. 1024
  14. 4356
  15. 1369
  16. 4489
  17. 2025
  18. 2209
  19. 6241
  20. 8649
  21. 9801
  22. 8836
  23. 1681
  24. 3721
  25. 4225
  26. 7569
  27. 2304
  28. 3364
  29. 1296
  30. 7225
  31. 9025
  32. 5041
  33. 1225
  34. 2916
  35. 5476
  36. 7396
  37. 7744
  38. 3481
  39. 3025
  40. 5329

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