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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 397 · 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. 1.93² =
  2. 2.36² =
  3. 3.66² =
  4. 4.51² =
  5. 5.84² =
  6. 6.37² =
  7. 7.75² =
  8. 8.45² =
  9. 9.58² =
  10. 10.39² =
  11. 11.81² =
  12. 12.67² =
  13. 13.47² =
  14. 14.46² =
  15. 15.78² =
  16. 16.85² =
  17. 17.91² =
  18. 18.48² =
  19. 19.95² =
  20. 20.98² =
  21. 21.38² =
  22. 22.71² =
  23. 23.61² =
  24. 24.62² =
  25. 25.41² =
  26. 26.63² =
  27. 27.32² =
  28. 28.52² =
  29. 29.65² =
  30. 30.64² =
  31. 31.42² =
  32. 32.33² =
  33. 33.44² =
  34. 34.54² =
  35. 35.49² =
  36. 36.43² =
  37. 37.56² =
  38. 38.99² =
  39. 39.69² =
  40. 40.53² =

Answer key

  1. 8649
  2. 1296
  3. 4356
  4. 2601
  5. 7056
  6. 1369
  7. 5625
  8. 2025
  9. 3364
  10. 1521
  11. 6561
  12. 4489
  13. 2209
  14. 2116
  15. 6084
  16. 7225
  17. 8281
  18. 2304
  19. 9025
  20. 9604
  21. 1444
  22. 5041
  23. 3721
  24. 3844
  25. 1681
  26. 3969
  27. 1024
  28. 2704
  29. 4225
  30. 4096
  31. 1764
  32. 1089
  33. 1936
  34. 2916
  35. 2401
  36. 1849
  37. 3136
  38. 9801
  39. 4761
  40. 2809

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