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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 418 · 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. 1.71² =
  2. 2.41² =
  3. 3.54² =
  4. 4.83² =
  5. 5.48² =
  6. 6.49² =
  7. 7.57² =
  8. 8.96² =
  9. 9.53² =
  10. 10.88² =
  11. 11.43² =
  12. 12.37² =
  13. 13.44² =
  14. 14.97² =
  15. 15.52² =
  16. 16.94² =
  17. 17.46² =
  18. 18.89² =
  19. 19.45² =
  20. 20.79² =
  21. 21.58² =
  22. 22.68² =
  23. 23.62² =
  24. 24.76² =
  25. 25.86² =
  26. 26.99² =
  27. 27.61² =
  28. 28.51² =
  29. 29.67² =
  30. 30.73² =
  31. 31.59² =
  32. 32.91² =
  33. 33.38² =
  34. 34.33² =
  35. 35.66² =
  36. 36.64² =
  37. 37.63² =
  38. 38.74² =
  39. 39.47² =
  40. 40.82² =

Answer key

  1. 5041
  2. 1681
  3. 2916
  4. 6889
  5. 2304
  6. 2401
  7. 3249
  8. 9216
  9. 2809
  10. 7744
  11. 1849
  12. 1369
  13. 1936
  14. 9409
  15. 2704
  16. 8836
  17. 2116
  18. 7921
  19. 2025
  20. 6241
  21. 3364
  22. 4624
  23. 3844
  24. 5776
  25. 7396
  26. 9801
  27. 3721
  28. 2601
  29. 4489
  30. 5329
  31. 3481
  32. 8281
  33. 1444
  34. 1089
  35. 4356
  36. 4096
  37. 3969
  38. 5476
  39. 2209
  40. 6724

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