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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 777 · 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. 2.51² =
  3. 3.81² =
  4. 4.51² =
  5. 5.51² =
  6. 6.31² =
  7. 7.89² =
  8. 8.49² =
  9. 9.21² =
  10. 10.41² =
  11. 11.59² =
  12. 12.79² =
  13. 13.29² =
  14. 14.69² =
  15. 15.41² =
  16. 16.81² =
  17. 17.19² =
  18. 18.61² =
  19. 19.59² =
  20. 20.49² =
  21. 21.61² =
  22. 22.59² =
  23. 23.79² =
  24. 24.61² =
  25. 25.29² =
  26. 26.91² =
  27. 27.31² =
  28. 28.31² =
  29. 29.21² =
  30. 30.71² =
  31. 31.79² =
  32. 32.89² =
  33. 33.29² =
  34. 34.71² =
  35. 35.81² =
  36. 36.41² =
  37. 37.51² =
  38. 38.79² =
  39. 39.89² =
  40. 40.19² =

Answer key

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

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