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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 364 · 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. 1.31² =
  2. 2.39² =
  3. 3.51² =
  4. 4.61² =
  5. 5.61² =
  6. 6.29² =
  7. 7.89² =
  8. 8.59² =
  9. 9.29² =
  10. 10.69² =
  11. 11.69² =
  12. 12.29² =
  13. 13.71² =
  14. 14.31² =
  15. 15.29² =
  16. 16.21² =
  17. 17.71² =
  18. 18.19² =
  19. 19.89² =
  20. 20.89² =
  21. 21.69² =
  22. 22.81² =
  23. 23.31² =
  24. 24.89² =
  25. 25.19² =
  26. 26.31² =
  27. 27.19² =
  28. 28.69² =
  29. 29.81² =
  30. 30.91² =
  31. 31.19² =
  32. 32.69² =
  33. 33.49² =
  34. 34.79² =
  35. 35.61² =
  36. 36.71² =
  37. 37.81² =
  38. 38.29² =
  39. 39.89² =
  40. 40.89² =

Answer key

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

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