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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 399 · 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. 2.19² =
  3. 3.89² =
  4. 4.59² =
  5. 5.61² =
  6. 6.51² =
  7. 7.61² =
  8. 8.41² =
  9. 9.39² =
  10. 10.91² =
  11. 11.91² =
  12. 12.89² =
  13. 13.79² =
  14. 14.31² =
  15. 15.31² =
  16. 16.41² =
  17. 17.71² =
  18. 18.89² =
  19. 19.51² =
  20. 20.69² =
  21. 21.71² =
  22. 22.59² =
  23. 23.19² =
  24. 24.61² =
  25. 25.41² =
  26. 26.29² =
  27. 27.79² =
  28. 28.79² =
  29. 29.79² =
  30. 30.41² =
  31. 31.61² =
  32. 32.49² =
  33. 33.41² =
  34. 34.21² =
  35. 35.49² =
  36. 36.79² =
  37. 37.29² =
  38. 38.51² =
  39. 39.79² =
  40. 40.89² =

Answer key

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

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