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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 237 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.71² =
  2. 2.51² =
  3. 3.69² =
  4. 4.89² =
  5. 5.19² =
  6. 6.41² =
  7. 7.29² =
  8. 8.21² =
  9. 9.19² =
  10. 10.91² =
  11. 11.49² =
  12. 12.29² =
  13. 13.39² =
  14. 14.79² =
  15. 15.79² =
  16. 16.59² =
  17. 17.51² =
  18. 18.91² =
  19. 19.39² =
  20. 20.19² =
  21. 21.41² =
  22. 22.71² =
  23. 23.79² =
  24. 24.89² =
  25. 25.31² =
  26. 26.89² =
  27. 27.19² =
  28. 28.59² =
  29. 29.79² =
  30. 30.91² =
  31. 31.89² =
  32. 32.49² =
  33. 33.21² =
  34. 34.59² =
  35. 35.49² =
  36. 36.49² =
  37. 37.81² =
  38. 38.71² =
  39. 39.19² =
  40. 40.19² =

Answer key

  1. 5041
  2. 2601
  3. 4761
  4. 7921
  5. 361
  6. 1681
  7. 841
  8. 441
  9. 361
  10. 8281
  11. 2401
  12. 841
  13. 1521
  14. 6241
  15. 6241
  16. 3481
  17. 2601
  18. 8281
  19. 1521
  20. 361
  21. 1681
  22. 5041
  23. 6241
  24. 7921
  25. 961
  26. 7921
  27. 361
  28. 3481
  29. 6241
  30. 8281
  31. 7921
  32. 2401
  33. 441
  34. 3481
  35. 2401
  36. 2401
  37. 6561
  38. 5041
  39. 361
  40. 361

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