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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 392 · 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. 2.91² =
  3. 3.91² =
  4. 4.59² =
  5. 5.89² =
  6. 6.29² =
  7. 7.71² =
  8. 8.29² =
  9. 9.19² =
  10. 10.29² =
  11. 11.61² =
  12. 12.39² =
  13. 13.19² =
  14. 14.89² =
  15. 15.51² =
  16. 16.29² =
  17. 17.89² =
  18. 18.51² =
  19. 19.89² =
  20. 20.29² =
  21. 21.51² =
  22. 22.61² =
  23. 23.91² =
  24. 24.49² =
  25. 25.79² =
  26. 26.29² =
  27. 27.69² =
  28. 28.51² =
  29. 29.81² =
  30. 30.41² =
  31. 31.59² =
  32. 32.61² =
  33. 33.89² =
  34. 34.29² =
  35. 35.69² =
  36. 36.89² =
  37. 37.79² =
  38. 38.19² =
  39. 39.41² =
  40. 40.29² =

Answer key

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

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