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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 275 · 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. 2.51² =
  3. 3.35² =
  4. 4.64² =
  5. 5.41² =
  6. 6.43² =
  7. 7.81² =
  8. 8.84² =
  9. 9.71² =
  10. 10.89² =
  11. 11.79² =
  12. 12.72² =
  13. 13.77² =
  14. 14.69² =
  15. 15.87² =
  16. 16.86² =
  17. 17.61² =
  18. 18.32² =
  19. 19.88² =
  20. 20.95² =
  21. 21.78² =
  22. 22.48² =
  23. 23.33² =
  24. 24.91² =
  25. 25.85² =
  26. 26.75² =
  27. 27.54² =
  28. 28.55² =
  29. 29.44² =
  30. 30.93² =
  31. 31.56² =
  32. 32.98² =
  33. 33.38² =
  34. 34.92² =
  35. 35.52² =
  36. 36.74² =
  37. 37.37² =
  38. 38.42² =
  39. 39.99² =
  40. 40.39² =

Answer key

  1. 2209
  2. 2601
  3. 1225
  4. 4096
  5. 1681
  6. 1849
  7. 6561
  8. 7056
  9. 5041
  10. 7921
  11. 6241
  12. 5184
  13. 5929
  14. 4761
  15. 7569
  16. 7396
  17. 3721
  18. 1024
  19. 7744
  20. 9025
  21. 6084
  22. 2304
  23. 1089
  24. 8281
  25. 7225
  26. 5625
  27. 2916
  28. 3025
  29. 1936
  30. 8649
  31. 3136
  32. 9604
  33. 1444
  34. 8464
  35. 2704
  36. 5476
  37. 1369
  38. 1764
  39. 9801
  40. 1521

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