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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 998 · 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. 2.31² =
  3. 3.72² =
  4. 4.65² =
  5. 5.45² =
  6. 6.35² =
  7. 7.99² =
  8. 8.73² =
  9. 9.46² =
  10. 10.69² =
  11. 11.36² =
  12. 12.43² =
  13. 13.37² =
  14. 14.74² =
  15. 15.51² =
  16. 16.56² =
  17. 17.47² =
  18. 18.71² =
  19. 19.41² =
  20. 20.78² =
  21. 21.34² =
  22. 22.52² =
  23. 23.67² =
  24. 24.86² =
  25. 25.39² =
  26. 26.58² =
  27. 27.85² =
  28. 28.98² =
  29. 29.84² =
  30. 30.87² =
  31. 31.61² =
  32. 32.38² =
  33. 33.81² =
  34. 34.57² =
  35. 35.95² =
  36. 36.44² =
  37. 37.89² =
  38. 38.79² =
  39. 39.97² =
  40. 40.75² =

Answer key

  1. 2304
  2. 961
  3. 5184
  4. 4225
  5. 2025
  6. 1225
  7. 9801
  8. 5329
  9. 2116
  10. 4761
  11. 1296
  12. 1849
  13. 1369
  14. 5476
  15. 2601
  16. 3136
  17. 2209
  18. 5041
  19. 1681
  20. 6084
  21. 1156
  22. 2704
  23. 4489
  24. 7396
  25. 1521
  26. 3364
  27. 7225
  28. 9604
  29. 7056
  30. 7569
  31. 3721
  32. 1444
  33. 6561
  34. 3249
  35. 9025
  36. 1936
  37. 7921
  38. 6241
  39. 9409
  40. 5625

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