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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 738 · 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. 1.32² =
  2. 2.31² =
  3. 3.38² =
  4. 4.61² =
  5. 5.54² =
  6. 6.53² =
  7. 7.47² =
  8. 8.62² =
  9. 9.41² =
  10. 10.88² =
  11. 11.71² =
  12. 12.78² =
  13. 13.68² =
  14. 14.85² =
  15. 15.67² =
  16. 16.43² =
  17. 17.37² =
  18. 18.84² =
  19. 19.34² =
  20. 20.95² =
  21. 21.81² =
  22. 22.82² =
  23. 23.57² =
  24. 24.63² =
  25. 25.51² =
  26. 26.75² =
  27. 27.33² =
  28. 28.52² =
  29. 29.79² =
  30. 30.39² =
  31. 31.89² =
  32. 32.45² =
  33. 33.46² =
  34. 34.83² =
  35. 35.97² =
  36. 36.66² =
  37. 37.98² =
  38. 38.58² =
  39. 39.72² =
  40. 40.44² =

Answer key

  1. 1024
  2. 961
  3. 1444
  4. 3721
  5. 2916
  6. 2809
  7. 2209
  8. 3844
  9. 1681
  10. 7744
  11. 5041
  12. 6084
  13. 4624
  14. 7225
  15. 4489
  16. 1849
  17. 1369
  18. 7056
  19. 1156
  20. 9025
  21. 6561
  22. 6724
  23. 3249
  24. 3969
  25. 2601
  26. 5625
  27. 1089
  28. 2704
  29. 6241
  30. 1521
  31. 7921
  32. 2025
  33. 2116
  34. 6889
  35. 9409
  36. 4356
  37. 9604
  38. 3364
  39. 5184
  40. 1936

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