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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 538 · 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. 2.49² =
  3. 3.31² =
  4. 4.89² =
  5. 5.91² =
  6. 6.49² =
  7. 7.81² =
  8. 8.79² =
  9. 9.49² =
  10. 10.21² =
  11. 11.49² =
  12. 12.39² =
  13. 13.91² =
  14. 14.29² =
  15. 15.49² =
  16. 16.21² =
  17. 17.41² =
  18. 18.79² =
  19. 19.29² =
  20. 20.71² =
  21. 21.19² =
  22. 22.69² =
  23. 23.89² =
  24. 24.71² =
  25. 25.61² =
  26. 26.69² =
  27. 27.49² =
  28. 28.31² =
  29. 29.79² =
  30. 30.59² =
  31. 31.51² =
  32. 32.69² =
  33. 33.21² =
  34. 34.59² =
  35. 35.91² =
  36. 36.81² =
  37. 37.61² =
  38. 38.69² =
  39. 39.69² =
  40. 40.71² =

Answer key

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

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