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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 630 · 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. 1.69² =
  2. 2.19² =
  3. 3.89² =
  4. 4.29² =
  5. 5.29² =
  6. 6.29² =
  7. 7.59² =
  8. 8.31² =
  9. 9.19² =
  10. 10.19² =
  11. 11.49² =
  12. 12.81² =
  13. 13.29² =
  14. 14.71² =
  15. 15.89² =
  16. 16.41² =
  17. 17.29² =
  18. 18.51² =
  19. 19.71² =
  20. 20.29² =
  21. 21.31² =
  22. 22.69² =
  23. 23.39² =
  24. 24.69² =
  25. 25.79² =
  26. 26.29² =
  27. 27.61² =
  28. 28.21² =
  29. 29.49² =
  30. 30.59² =
  31. 31.59² =
  32. 32.71² =
  33. 33.59² =
  34. 34.79² =
  35. 35.51² =
  36. 36.91² =
  37. 37.69² =
  38. 38.31² =
  39. 39.29² =
  40. 40.89² =

Answer key

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

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