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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 312 · 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. 2.49² =
  3. 3.91² =
  4. 4.69² =
  5. 5.59² =
  6. 6.39² =
  7. 7.61² =
  8. 8.71² =
  9. 9.49² =
  10. 10.71² =
  11. 11.81² =
  12. 12.81² =
  13. 13.79² =
  14. 14.71² =
  15. 15.81² =
  16. 16.39² =
  17. 17.31² =
  18. 18.89² =
  19. 19.49² =
  20. 20.51² =
  21. 21.59² =
  22. 22.39² =
  23. 23.51² =
  24. 24.39² =
  25. 25.29² =
  26. 26.29² =
  27. 27.79² =
  28. 28.29² =
  29. 29.31² =
  30. 30.41² =
  31. 31.79² =
  32. 32.89² =
  33. 33.29² =
  34. 34.69² =
  35. 35.49² =
  36. 36.31² =
  37. 37.19² =
  38. 38.49² =
  39. 39.59² =
  40. 40.89² =

Answer key

  1. 961
  2. 2401
  3. 8281
  4. 4761
  5. 3481
  6. 1521
  7. 3721
  8. 5041
  9. 2401
  10. 5041
  11. 6561
  12. 6561
  13. 6241
  14. 5041
  15. 6561
  16. 1521
  17. 961
  18. 7921
  19. 2401
  20. 2601
  21. 3481
  22. 1521
  23. 2601
  24. 1521
  25. 841
  26. 841
  27. 6241
  28. 841
  29. 961
  30. 1681
  31. 6241
  32. 7921
  33. 841
  34. 4761
  35. 2401
  36. 961
  37. 361
  38. 2401
  39. 3481
  40. 7921

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