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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 464 · 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. 1.48² =
  2. 2.72² =
  3. 3.83² =
  4. 4.68² =
  5. 5.69² =
  6. 6.33² =
  7. 7.61² =
  8. 8.52² =
  9. 9.89² =
  10. 10.55² =
  11. 11.35² =
  12. 12.75² =
  13. 13.85² =
  14. 14.47² =
  15. 15.51² =
  16. 16.71² =
  17. 17.43² =
  18. 18.44² =
  19. 19.42² =
  20. 20.88² =
  21. 21.63² =
  22. 22.53² =
  23. 23.78² =
  24. 24.98² =
  25. 25.93² =
  26. 26.65² =
  27. 27.41² =
  28. 28.45² =
  29. 29.84² =
  30. 30.91² =
  31. 31.32² =
  32. 32.36² =
  33. 33.81² =
  34. 34.64² =
  35. 35.37² =
  36. 36.39² =
  37. 37.31² =
  38. 38.34² =
  39. 39.82² =
  40. 40.67² =

Answer key

  1. 2304
  2. 5184
  3. 6889
  4. 4624
  5. 4761
  6. 1089
  7. 3721
  8. 2704
  9. 7921
  10. 3025
  11. 1225
  12. 5625
  13. 7225
  14. 2209
  15. 2601
  16. 5041
  17. 1849
  18. 1936
  19. 1764
  20. 7744
  21. 3969
  22. 2809
  23. 6084
  24. 9604
  25. 8649
  26. 4225
  27. 1681
  28. 2025
  29. 7056
  30. 8281
  31. 1024
  32. 1296
  33. 6561
  34. 4096
  35. 1369
  36. 1521
  37. 961
  38. 1156
  39. 6724
  40. 4489

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