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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 586 · 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. 1.61² =
  2. 2.51² =
  3. 3.51² =
  4. 4.29² =
  5. 5.71² =
  6. 6.29² =
  7. 7.59² =
  8. 8.69² =
  9. 9.71² =
  10. 10.79² =
  11. 11.29² =
  12. 12.61² =
  13. 13.79² =
  14. 14.89² =
  15. 15.81² =
  16. 16.49² =
  17. 17.79² =
  18. 18.19² =
  19. 19.71² =
  20. 20.41² =
  21. 21.69² =
  22. 22.21² =
  23. 23.69² =
  24. 24.29² =
  25. 25.39² =
  26. 26.51² =
  27. 27.29² =
  28. 28.79² =
  29. 29.91² =
  30. 30.21² =
  31. 31.59² =
  32. 32.81² =
  33. 33.49² =
  34. 34.69² =
  35. 35.29² =
  36. 36.71² =
  37. 37.49² =
  38. 38.79² =
  39. 39.19² =
  40. 40.51² =

Answer key

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

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