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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 523 · 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. 1.19² =
  2. 2.29² =
  3. 3.81² =
  4. 4.39² =
  5. 5.61² =
  6. 6.19² =
  7. 7.79² =
  8. 8.21² =
  9. 9.79² =
  10. 10.71² =
  11. 11.59² =
  12. 12.31² =
  13. 13.29² =
  14. 14.51² =
  15. 15.69² =
  16. 16.19² =
  17. 17.51² =
  18. 18.89² =
  19. 19.51² =
  20. 20.19² =
  21. 21.51² =
  22. 22.29² =
  23. 23.29² =
  24. 24.79² =
  25. 25.59² =
  26. 26.29² =
  27. 27.59² =
  28. 28.21² =
  29. 29.91² =
  30. 30.69² =
  31. 31.31² =
  32. 32.91² =
  33. 33.49² =
  34. 34.79² =
  35. 35.29² =
  36. 36.61² =
  37. 37.71² =
  38. 38.61² =
  39. 39.71² =
  40. 40.41² =

Answer key

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

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