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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 392 · 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. 1.35² =
  2. 2.42² =
  3. 3.49² =
  4. 4.96² =
  5. 5.44² =
  6. 6.51² =
  7. 7.73² =
  8. 8.82² =
  9. 9.32² =
  10. 10.56² =
  11. 11.62² =
  12. 12.89² =
  13. 13.98² =
  14. 14.99² =
  15. 15.66² =
  16. 16.52² =
  17. 17.53² =
  18. 18.88² =
  19. 19.58² =
  20. 20.38² =
  21. 21.48² =
  22. 22.36² =
  23. 23.71² =
  24. 24.86² =
  25. 25.55² =
  26. 26.75² =
  27. 27.87² =
  28. 28.78² =
  29. 29.97² =
  30. 30.91² =
  31. 31.69² =
  32. 32.43² =
  33. 33.64² =
  34. 34.85² =
  35. 35.67² =
  36. 36.41² =
  37. 37.37² =
  38. 38.33² =
  39. 39.68² =
  40. 40.39² =

Answer key

  1. 1225
  2. 1764
  3. 2401
  4. 9216
  5. 1936
  6. 2601
  7. 5329
  8. 6724
  9. 1024
  10. 3136
  11. 3844
  12. 7921
  13. 9604
  14. 9801
  15. 4356
  16. 2704
  17. 2809
  18. 7744
  19. 3364
  20. 1444
  21. 2304
  22. 1296
  23. 5041
  24. 7396
  25. 3025
  26. 5625
  27. 7569
  28. 6084
  29. 9409
  30. 8281
  31. 4761
  32. 1849
  33. 4096
  34. 7225
  35. 4489
  36. 1681
  37. 1369
  38. 1089
  39. 4624
  40. 1521

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