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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 475 · 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. 1.79² =
  2. 2.67² =
  3. 3.76² =
  4. 4.94² =
  5. 5.35² =
  6. 6.45² =
  7. 7.71² =
  8. 8.97² =
  9. 9.54² =
  10. 10.73² =
  11. 11.55² =
  12. 12.78² =
  13. 13.58² =
  14. 14.64² =
  15. 15.81² =
  16. 16.91² =
  17. 17.33² =
  18. 18.46² =
  19. 19.34² =
  20. 20.87² =
  21. 21.68² =
  22. 22.82² =
  23. 23.99² =
  24. 24.52² =
  25. 25.36² =
  26. 26.92² =
  27. 27.39² =
  28. 28.84² =
  29. 29.63² =
  30. 30.48² =
  31. 31.88² =
  32. 32.65² =
  33. 33.38² =
  34. 34.41² =
  35. 35.51² =
  36. 36.89² =
  37. 37.49² =
  38. 38.95² =
  39. 39.44² =
  40. 40.72² =

Answer key

  1. 6241
  2. 4489
  3. 5776
  4. 8836
  5. 1225
  6. 2025
  7. 5041
  8. 9409
  9. 2916
  10. 5329
  11. 3025
  12. 6084
  13. 3364
  14. 4096
  15. 6561
  16. 8281
  17. 1089
  18. 2116
  19. 1156
  20. 7569
  21. 4624
  22. 6724
  23. 9801
  24. 2704
  25. 1296
  26. 8464
  27. 1521
  28. 7056
  29. 3969
  30. 2304
  31. 7744
  32. 4225
  33. 1444
  34. 1681
  35. 2601
  36. 7921
  37. 2401
  38. 9025
  39. 1936
  40. 5184

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