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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 30 · 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. 1.46² =
  2. 2.73² =
  3. 3.61² =
  4. 4.31² =
  5. 5.41² =
  6. 6.71² =
  7. 7.52² =
  8. 8.88² =
  9. 9.44² =
  10. 10.57² =
  11. 11.55² =
  12. 12.78² =
  13. 13.86² =
  14. 14.63² =
  15. 15.66² =
  16. 16.75² =
  17. 17.58² =
  18. 18.89² =
  19. 19.99² =
  20. 20.98² =
  21. 21.43² =
  22. 22.49² =
  23. 23.37² =
  24. 24.83² =
  25. 25.51² =
  26. 26.53² =
  27. 27.42² =
  28. 28.33² =
  29. 29.79² =
  30. 30.64² =
  31. 31.74² =
  32. 32.72² =
  33. 33.67² =
  34. 34.34² =
  35. 35.45² =
  36. 36.82² =
  37. 37.69² =
  38. 38.84² =
  39. 39.81² =
  40. 40.97² =

Answer key

  1. 2116
  2. 5329
  3. 3721
  4. 961
  5. 1681
  6. 5041
  7. 2704
  8. 7744
  9. 1936
  10. 3249
  11. 3025
  12. 6084
  13. 7396
  14. 3969
  15. 4356
  16. 5625
  17. 3364
  18. 7921
  19. 9801
  20. 9604
  21. 1849
  22. 2401
  23. 1369
  24. 6889
  25. 2601
  26. 2809
  27. 1764
  28. 1089
  29. 6241
  30. 4096
  31. 5476
  32. 5184
  33. 4489
  34. 1156
  35. 2025
  36. 6724
  37. 4761
  38. 7056
  39. 6561
  40. 9409

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