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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 510 · 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. 2.39² =
  3. 3.41² =
  4. 4.79² =
  5. 5.41² =
  6. 6.81² =
  7. 7.61² =
  8. 8.49² =
  9. 9.21² =
  10. 10.69² =
  11. 11.61² =
  12. 12.71² =
  13. 13.89² =
  14. 14.29² =
  15. 15.31² =
  16. 16.89² =
  17. 17.49² =
  18. 18.61² =
  19. 19.89² =
  20. 20.49² =
  21. 21.81² =
  22. 22.61² =
  23. 23.21² =
  24. 24.41² =
  25. 25.79² =
  26. 26.29² =
  27. 27.51² =
  28. 28.21² =
  29. 29.31² =
  30. 30.89² =
  31. 31.89² =
  32. 32.79² =
  33. 33.71² =
  34. 34.79² =
  35. 35.31² =
  36. 36.49² =
  37. 37.69² =
  38. 38.61² =
  39. 39.71² =
  40. 40.91² =

Answer key

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

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