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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 705 · 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. 1.41² =
  2. 2.73² =
  3. 3.61² =
  4. 4.59² =
  5. 5.45² =
  6. 6.94² =
  7. 7.97² =
  8. 8.95² =
  9. 9.77² =
  10. 10.47² =
  11. 11.92² =
  12. 12.32² =
  13. 13.66² =
  14. 14.48² =
  15. 15.98² =
  16. 16.85² =
  17. 17.56² =
  18. 18.96² =
  19. 19.71² =
  20. 20.64² =
  21. 21.86² =
  22. 22.81² =
  23. 23.88² =
  24. 24.52² =
  25. 25.76² =
  26. 26.79² =
  27. 27.51² =
  28. 28.68² =
  29. 29.55² =
  30. 30.83² =
  31. 31.57² =
  32. 32.91² =
  33. 33.43² =
  34. 34.72² =
  35. 35.39² =
  36. 36.69² =
  37. 37.87² =
  38. 38.93² =
  39. 39.65² =
  40. 40.63² =

Answer key

  1. 1681
  2. 5329
  3. 3721
  4. 3481
  5. 2025
  6. 8836
  7. 9409
  8. 9025
  9. 5929
  10. 2209
  11. 8464
  12. 1024
  13. 4356
  14. 2304
  15. 9604
  16. 7225
  17. 3136
  18. 9216
  19. 5041
  20. 4096
  21. 7396
  22. 6561
  23. 7744
  24. 2704
  25. 5776
  26. 6241
  27. 2601
  28. 4624
  29. 3025
  30. 6889
  31. 3249
  32. 8281
  33. 1849
  34. 5184
  35. 1521
  36. 4761
  37. 7569
  38. 8649
  39. 4225
  40. 3969

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