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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 289 · 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. 1.51² =
  2. 2.19² =
  3. 3.21² =
  4. 4.21² =
  5. 5.91² =
  6. 6.21² =
  7. 7.89² =
  8. 8.19² =
  9. 9.79² =
  10. 10.71² =
  11. 11.31² =
  12. 12.29² =
  13. 13.61² =
  14. 14.29² =
  15. 15.49² =
  16. 16.71² =
  17. 17.19² =
  18. 18.51² =
  19. 19.29² =
  20. 20.89² =
  21. 21.59² =
  22. 22.39² =
  23. 23.81² =
  24. 24.31² =
  25. 25.51² =
  26. 26.31² =
  27. 27.31² =
  28. 28.19² =
  29. 29.21² =
  30. 30.69² =
  31. 31.71² =
  32. 32.69² =
  33. 33.91² =
  34. 34.19² =
  35. 35.71² =
  36. 36.59² =
  37. 37.69² =
  38. 38.21² =
  39. 39.19² =
  40. 40.59² =

Answer key

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

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