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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 716 · 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. 3.21² =
  4. 4.89² =
  5. 5.91² =
  6. 6.49² =
  7. 7.51² =
  8. 8.69² =
  9. 9.49² =
  10. 10.69² =
  11. 11.39² =
  12. 12.51² =
  13. 13.21² =
  14. 14.79² =
  15. 15.61² =
  16. 16.49² =
  17. 17.29² =
  18. 18.41² =
  19. 19.29² =
  20. 20.79² =
  21. 21.39² =
  22. 22.91² =
  23. 23.59² =
  24. 24.61² =
  25. 25.69² =
  26. 26.79² =
  27. 27.39² =
  28. 28.91² =
  29. 29.29² =
  30. 30.29² =
  31. 31.19² =
  32. 32.81² =
  33. 33.31² =
  34. 34.91² =
  35. 35.29² =
  36. 36.91² =
  37. 37.29² =
  38. 38.79² =
  39. 39.49² =
  40. 40.61² =

Answer key

  1. 841
  2. 961
  3. 441
  4. 7921
  5. 8281
  6. 2401
  7. 2601
  8. 4761
  9. 2401
  10. 4761
  11. 1521
  12. 2601
  13. 441
  14. 6241
  15. 3721
  16. 2401
  17. 841
  18. 1681
  19. 841
  20. 6241
  21. 1521
  22. 8281
  23. 3481
  24. 3721
  25. 4761
  26. 6241
  27. 1521
  28. 8281
  29. 841
  30. 841
  31. 361
  32. 6561
  33. 961
  34. 8281
  35. 841
  36. 8281
  37. 841
  38. 6241
  39. 2401
  40. 3721

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