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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 395 · 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. 2.89² =
  3. 3.49² =
  4. 4.64² =
  5. 5.66² =
  6. 6.95² =
  7. 7.86² =
  8. 8.32² =
  9. 9.37² =
  10. 10.47² =
  11. 11.46² =
  12. 12.82² =
  13. 13.41² =
  14. 14.35² =
  15. 15.91² =
  16. 16.48² =
  17. 17.36² =
  18. 18.76² =
  19. 19.81² =
  20. 20.51² =
  21. 21.68² =
  22. 22.39² =
  23. 23.99² =
  24. 24.88² =
  25. 25.38² =
  26. 26.74² =
  27. 27.54² =
  28. 28.42² =
  29. 29.77² =
  30. 30.83² =
  31. 31.84² =
  32. 32.71² =
  33. 33.53² =
  34. 34.79² =
  35. 35.52² =
  36. 36.98² =
  37. 37.57² =
  38. 38.33² =
  39. 39.63² =
  40. 40.97² =

Answer key

  1. 961
  2. 7921
  3. 2401
  4. 4096
  5. 4356
  6. 9025
  7. 7396
  8. 1024
  9. 1369
  10. 2209
  11. 2116
  12. 6724
  13. 1681
  14. 1225
  15. 8281
  16. 2304
  17. 1296
  18. 5776
  19. 6561
  20. 2601
  21. 4624
  22. 1521
  23. 9801
  24. 7744
  25. 1444
  26. 5476
  27. 2916
  28. 1764
  29. 5929
  30. 6889
  31. 7056
  32. 5041
  33. 2809
  34. 6241
  35. 2704
  36. 9604
  37. 3249
  38. 1089
  39. 3969
  40. 9409

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