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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 361 · 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. 1.47² =
  2. 2.44² =
  3. 3.81² =
  4. 4.67² =
  5. 5.41² =
  6. 6.75² =
  7. 7.98² =
  8. 8.94² =
  9. 9.77² =
  10. 10.76² =
  11. 11.54² =
  12. 12.36² =
  13. 13.79² =
  14. 14.82² =
  15. 15.95² =
  16. 16.83² =
  17. 17.42² =
  18. 18.62² =
  19. 19.51² =
  20. 20.46² =
  21. 21.72² =
  22. 22.61² =
  23. 23.71² =
  24. 24.88² =
  25. 25.48² =
  26. 26.96² =
  27. 27.58² =
  28. 28.91² =
  29. 29.38² =
  30. 30.31² =
  31. 31.78² =
  32. 32.97² =
  33. 33.33² =
  34. 34.52² =
  35. 35.89² =
  36. 36.49² =
  37. 37.56² =
  38. 38.59² =
  39. 39.86² =
  40. 40.74² =

Answer key

  1. 2209
  2. 1936
  3. 6561
  4. 4489
  5. 1681
  6. 5625
  7. 9604
  8. 8836
  9. 5929
  10. 5776
  11. 2916
  12. 1296
  13. 6241
  14. 6724
  15. 9025
  16. 6889
  17. 1764
  18. 3844
  19. 2601
  20. 2116
  21. 5184
  22. 3721
  23. 5041
  24. 7744
  25. 2304
  26. 9216
  27. 3364
  28. 8281
  29. 1444
  30. 961
  31. 6084
  32. 9409
  33. 1089
  34. 2704
  35. 7921
  36. 2401
  37. 3136
  38. 3481
  39. 7396
  40. 5476

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