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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 171 · 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. 1.51² =
  2. 2.69² =
  3. 3.79² =
  4. 4.49² =
  5. 5.71² =
  6. 6.59² =
  7. 7.79² =
  8. 8.69² =
  9. 9.61² =
  10. 10.51² =
  11. 11.69² =
  12. 12.39² =
  13. 13.31² =
  14. 14.91² =
  15. 15.71² =
  16. 16.79² =
  17. 17.81² =
  18. 18.49² =
  19. 19.49² =
  20. 20.79² =
  21. 21.79² =
  22. 22.31² =
  23. 23.41² =
  24. 24.41² =
  25. 25.49² =
  26. 26.29² =
  27. 27.39² =
  28. 28.69² =
  29. 29.89² =
  30. 30.41² =
  31. 31.29² =
  32. 32.79² =
  33. 33.81² =
  34. 34.81² =
  35. 35.21² =
  36. 36.51² =
  37. 37.59² =
  38. 38.81² =
  39. 39.49² =
  40. 40.91² =

Answer key

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

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