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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 826 · 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. 2.42² =
  3. 3.46² =
  4. 4.79² =
  5. 5.89² =
  6. 6.61² =
  7. 7.56² =
  8. 8.81² =
  9. 9.38² =
  10. 10.48² =
  11. 11.64² =
  12. 12.97² =
  13. 13.86² =
  14. 14.69² =
  15. 15.72² =
  16. 16.41² =
  17. 17.55² =
  18. 18.99² =
  19. 19.68² =
  20. 20.84² =
  21. 21.31² =
  22. 22.71² =
  23. 23.75² =
  24. 24.96² =
  25. 25.39² =
  26. 26.44² =
  27. 27.65² =
  28. 28.67² =
  29. 29.45² =
  30. 30.34² =
  31. 31.91² =
  32. 32.51² =
  33. 33.52² =
  34. 34.85² =
  35. 35.59² =
  36. 36.32² =
  37. 37.43² =
  38. 38.76² =
  39. 39.35² =
  40. 40.82² =

Answer key

  1. 2209
  2. 1764
  3. 2116
  4. 6241
  5. 7921
  6. 3721
  7. 3136
  8. 6561
  9. 1444
  10. 2304
  11. 4096
  12. 9409
  13. 7396
  14. 4761
  15. 5184
  16. 1681
  17. 3025
  18. 9801
  19. 4624
  20. 7056
  21. 961
  22. 5041
  23. 5625
  24. 9216
  25. 1521
  26. 1936
  27. 4225
  28. 4489
  29. 2025
  30. 1156
  31. 8281
  32. 2601
  33. 2704
  34. 7225
  35. 3481
  36. 1024
  37. 1849
  38. 5776
  39. 1225
  40. 6724

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