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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 328 · 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. 1.29² =
  2. 2.31² =
  3. 3.49² =
  4. 4.39² =
  5. 5.29² =
  6. 6.89² =
  7. 7.59² =
  8. 8.91² =
  9. 9.51² =
  10. 10.91² =
  11. 11.29² =
  12. 12.51² =
  13. 13.39² =
  14. 14.39² =
  15. 15.31² =
  16. 16.59² =
  17. 17.19² =
  18. 18.31² =
  19. 19.71² =
  20. 20.51² =
  21. 21.69² =
  22. 22.79² =
  23. 23.91² =
  24. 24.39² =
  25. 25.69² =
  26. 26.59² =
  27. 27.79² =
  28. 28.59² =
  29. 29.19² =
  30. 30.29² =
  31. 31.51² =
  32. 32.69² =
  33. 33.19² =
  34. 34.79² =
  35. 35.31² =
  36. 36.39² =
  37. 37.49² =
  38. 38.91² =
  39. 39.89² =
  40. 40.81² =

Answer key

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

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