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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 722 · 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. 1.44² =
  2. 2.81² =
  3. 3.72² =
  4. 4.58² =
  5. 5.85² =
  6. 6.32² =
  7. 7.82² =
  8. 8.89² =
  9. 9.52² =
  10. 10.92² =
  11. 11.43² =
  12. 12.37² =
  13. 13.47² =
  14. 14.87² =
  15. 15.64² =
  16. 16.66² =
  17. 17.51² =
  18. 18.46² =
  19. 19.97² =
  20. 20.34² =
  21. 21.48² =
  22. 22.68² =
  23. 23.33² =
  24. 24.39² =
  25. 25.91² =
  26. 26.83² =
  27. 27.45² =
  28. 28.53² =
  29. 29.71² =
  30. 30.76² =
  31. 31.38² =
  32. 32.41² =
  33. 33.56² =
  34. 34.79² =
  35. 35.96² =
  36. 36.31² =
  37. 37.78² =
  38. 38.59² =
  39. 39.99² =
  40. 40.74² =

Answer key

  1. 1936
  2. 6561
  3. 5184
  4. 3364
  5. 7225
  6. 1024
  7. 6724
  8. 7921
  9. 2704
  10. 8464
  11. 1849
  12. 1369
  13. 2209
  14. 7569
  15. 4096
  16. 4356
  17. 2601
  18. 2116
  19. 9409
  20. 1156
  21. 2304
  22. 4624
  23. 1089
  24. 1521
  25. 8281
  26. 6889
  27. 2025
  28. 2809
  29. 5041
  30. 5776
  31. 1444
  32. 1681
  33. 3136
  34. 6241
  35. 9216
  36. 961
  37. 6084
  38. 3481
  39. 9801
  40. 5476

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