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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 641 · 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. 1.83² =
  2. 2.69² =
  3. 3.58² =
  4. 4.36² =
  5. 5.44² =
  6. 6.73² =
  7. 7.94² =
  8. 8.88² =
  9. 9.85² =
  10. 10.91² =
  11. 11.77² =
  12. 12.87² =
  13. 13.52² =
  14. 14.67² =
  15. 15.72² =
  16. 16.71² =
  17. 17.92² =
  18. 18.38² =
  19. 19.51² =
  20. 20.84² =
  21. 21.75² =
  22. 22.64² =
  23. 23.32² =
  24. 24.97² =
  25. 25.56² =
  26. 26.39² =
  27. 27.79² =
  28. 28.86² =
  29. 29.99² =
  30. 30.74² =
  31. 31.37² =
  32. 32.48² =
  33. 33.98² =
  34. 34.43² =
  35. 35.57² =
  36. 36.66² =
  37. 37.78² =
  38. 38.41² =
  39. 39.42² =
  40. 40.82² =

Answer key

  1. 6889
  2. 4761
  3. 3364
  4. 1296
  5. 1936
  6. 5329
  7. 8836
  8. 7744
  9. 7225
  10. 8281
  11. 5929
  12. 7569
  13. 2704
  14. 4489
  15. 5184
  16. 5041
  17. 8464
  18. 1444
  19. 2601
  20. 7056
  21. 5625
  22. 4096
  23. 1024
  24. 9409
  25. 3136
  26. 1521
  27. 6241
  28. 7396
  29. 9801
  30. 5476
  31. 1369
  32. 2304
  33. 9604
  34. 1849
  35. 3249
  36. 4356
  37. 6084
  38. 1681
  39. 1764
  40. 6724

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