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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 671 · 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. 1.31² =
  2. 2.41² =
  3. 3.77² =
  4. 4.57² =
  5. 5.86² =
  6. 6.75² =
  7. 7.37² =
  8. 8.61² =
  9. 9.66² =
  10. 10.74² =
  11. 11.76² =
  12. 12.71² =
  13. 13.51² =
  14. 14.67² =
  15. 15.64² =
  16. 16.85² =
  17. 17.73² =
  18. 18.55² =
  19. 19.32² =
  20. 20.33² =
  21. 21.43² =
  22. 22.63² =
  23. 23.72² =
  24. 24.79² =
  25. 25.52² =
  26. 26.38² =
  27. 27.99² =
  28. 28.34² =
  29. 29.78² =
  30. 30.69² =
  31. 31.49² =
  32. 32.84² =
  33. 33.42² =
  34. 34.91² =
  35. 35.58² =
  36. 36.94² =
  37. 37.35² =
  38. 38.68² =
  39. 39.48² =
  40. 40.44² =

Answer key

  1. 961
  2. 1681
  3. 5929
  4. 3249
  5. 7396
  6. 5625
  7. 1369
  8. 3721
  9. 4356
  10. 5476
  11. 5776
  12. 5041
  13. 2601
  14. 4489
  15. 4096
  16. 7225
  17. 5329
  18. 3025
  19. 1024
  20. 1089
  21. 1849
  22. 3969
  23. 5184
  24. 6241
  25. 2704
  26. 1444
  27. 9801
  28. 1156
  29. 6084
  30. 4761
  31. 2401
  32. 7056
  33. 1764
  34. 8281
  35. 3364
  36. 8836
  37. 1225
  38. 4624
  39. 2304
  40. 1936

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