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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 619 · 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. 2.79² =
  3. 3.79² =
  4. 4.89² =
  5. 5.29² =
  6. 6.49² =
  7. 7.79² =
  8. 8.31² =
  9. 9.51² =
  10. 10.49² =
  11. 11.41² =
  12. 12.71² =
  13. 13.21² =
  14. 14.61² =
  15. 15.59² =
  16. 16.61² =
  17. 17.29² =
  18. 18.41² =
  19. 19.19² =
  20. 20.91² =
  21. 21.61² =
  22. 22.19² =
  23. 23.59² =
  24. 24.19² =
  25. 25.61² =
  26. 26.59² =
  27. 27.49² =
  28. 28.59² =
  29. 29.31² =
  30. 30.81² =
  31. 31.79² =
  32. 32.71² =
  33. 33.51² =
  34. 34.49² =
  35. 35.21² =
  36. 36.79² =
  37. 37.91² =
  38. 38.59² =
  39. 39.29² =
  40. 40.39² =

Answer key

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

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