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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 198 · 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. 1.61² =
  2. 2.21² =
  3. 3.29² =
  4. 4.21² =
  5. 5.61² =
  6. 6.29² =
  7. 7.49² =
  8. 8.89² =
  9. 9.69² =
  10. 10.19² =
  11. 11.19² =
  12. 12.49² =
  13. 13.21² =
  14. 14.91² =
  15. 15.61² =
  16. 16.51² =
  17. 17.89² =
  18. 18.21² =
  19. 19.79² =
  20. 20.59² =
  21. 21.61² =
  22. 22.51² =
  23. 23.91² =
  24. 24.39² =
  25. 25.31² =
  26. 26.21² =
  27. 27.59² =
  28. 28.51² =
  29. 29.89² =
  30. 30.89² =
  31. 31.71² =
  32. 32.41² =
  33. 33.81² =
  34. 34.79² =
  35. 35.19² =
  36. 36.51² =
  37. 37.29² =
  38. 38.29² =
  39. 39.71² =
  40. 40.41² =

Answer key

  1. 3721
  2. 441
  3. 841
  4. 441
  5. 3721
  6. 841
  7. 2401
  8. 7921
  9. 4761
  10. 361
  11. 361
  12. 2401
  13. 441
  14. 8281
  15. 3721
  16. 2601
  17. 7921
  18. 441
  19. 6241
  20. 3481
  21. 3721
  22. 2601
  23. 8281
  24. 1521
  25. 961
  26. 441
  27. 3481
  28. 2601
  29. 7921
  30. 7921
  31. 5041
  32. 1681
  33. 6561
  34. 6241
  35. 361
  36. 2601
  37. 841
  38. 841
  39. 5041
  40. 1681

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