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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 38 · 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. 1.51² =
  2. 2.37² =
  3. 3.61² =
  4. 4.43² =
  5. 5.49² =
  6. 6.48² =
  7. 7.66² =
  8. 8.58² =
  9. 9.88² =
  10. 10.91² =
  11. 11.76² =
  12. 12.81² =
  13. 13.71² =
  14. 14.57² =
  15. 15.99² =
  16. 16.97² =
  17. 17.65² =
  18. 18.34² =
  19. 19.52² =
  20. 20.45² =
  21. 21.59² =
  22. 22.95² =
  23. 23.93² =
  24. 24.63² =
  25. 25.67² =
  26. 26.75² =
  27. 27.94² =
  28. 28.41² =
  29. 29.47² =
  30. 30.56² =
  31. 31.68² =
  32. 32.53² =
  33. 33.85² =
  34. 34.44² =
  35. 35.69² =
  36. 36.89² =
  37. 37.87² =
  38. 38.98² =
  39. 39.46² =
  40. 40.36² =

Answer key

  1. 2601
  2. 1369
  3. 3721
  4. 1849
  5. 2401
  6. 2304
  7. 4356
  8. 3364
  9. 7744
  10. 8281
  11. 5776
  12. 6561
  13. 5041
  14. 3249
  15. 9801
  16. 9409
  17. 4225
  18. 1156
  19. 2704
  20. 2025
  21. 3481
  22. 9025
  23. 8649
  24. 3969
  25. 4489
  26. 5625
  27. 8836
  28. 1681
  29. 2209
  30. 3136
  31. 4624
  32. 2809
  33. 7225
  34. 1936
  35. 4761
  36. 7921
  37. 7569
  38. 9604
  39. 2116
  40. 1296

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