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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 193 · 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. 1.21² =
  2. 2.69² =
  3. 3.89² =
  4. 4.29² =
  5. 5.79² =
  6. 6.21² =
  7. 7.29² =
  8. 8.71² =
  9. 9.51² =
  10. 10.29² =
  11. 11.61² =
  12. 12.69² =
  13. 13.39² =
  14. 14.69² =
  15. 15.21² =
  16. 16.29² =
  17. 17.19² =
  18. 18.59² =
  19. 19.91² =
  20. 20.51² =
  21. 21.39² =
  22. 22.29² =
  23. 23.39² =
  24. 24.91² =
  25. 25.79² =
  26. 26.51² =
  27. 27.69² =
  28. 28.59² =
  29. 29.29² =
  30. 30.39² =
  31. 31.79² =
  32. 32.29² =
  33. 33.29² =
  34. 34.71² =
  35. 35.79² =
  36. 36.39² =
  37. 37.29² =
  38. 38.51² =
  39. 39.69² =
  40. 40.81² =

Answer key

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

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