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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 202 · 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. 2.21² =
  3. 3.71² =
  4. 4.39² =
  5. 5.91² =
  6. 6.31² =
  7. 7.39² =
  8. 8.81² =
  9. 9.71² =
  10. 10.51² =
  11. 11.61² =
  12. 12.69² =
  13. 13.51² =
  14. 14.19² =
  15. 15.19² =
  16. 16.19² =
  17. 17.79² =
  18. 18.59² =
  19. 19.29² =
  20. 20.29² =
  21. 21.79² =
  22. 22.41² =
  23. 23.41² =
  24. 24.31² =
  25. 25.29² =
  26. 26.89² =
  27. 27.49² =
  28. 28.21² =
  29. 29.61² =
  30. 30.91² =
  31. 31.51² =
  32. 32.61² =
  33. 33.49² =
  34. 34.89² =
  35. 35.29² =
  36. 36.79² =
  37. 37.31² =
  38. 38.79² =
  39. 39.69² =
  40. 40.71² =

Answer key

  1. 441
  2. 441
  3. 5041
  4. 1521
  5. 8281
  6. 961
  7. 1521
  8. 6561
  9. 5041
  10. 2601
  11. 3721
  12. 4761
  13. 2601
  14. 361
  15. 361
  16. 361
  17. 6241
  18. 3481
  19. 841
  20. 841
  21. 6241
  22. 1681
  23. 1681
  24. 961
  25. 841
  26. 7921
  27. 2401
  28. 441
  29. 3721
  30. 8281
  31. 2601
  32. 3721
  33. 2401
  34. 7921
  35. 841
  36. 6241
  37. 961
  38. 6241
  39. 4761
  40. 5041

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