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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 126 · 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. 2.71² =
  3. 3.89² =
  4. 4.71² =
  5. 5.81² =
  6. 6.91² =
  7. 7.59² =
  8. 8.51² =
  9. 9.69² =
  10. 10.41² =
  11. 11.59² =
  12. 12.91² =
  13. 13.71² =
  14. 14.89² =
  15. 15.89² =
  16. 16.51² =
  17. 17.69² =
  18. 18.71² =
  19. 19.51² =
  20. 20.29² =
  21. 21.79² =
  22. 22.61² =
  23. 23.29² =
  24. 24.89² =
  25. 25.41² =
  26. 26.49² =
  27. 27.89² =
  28. 28.21² =
  29. 29.71² =
  30. 30.19² =
  31. 31.19² =
  32. 32.59² =
  33. 33.89² =
  34. 34.31² =
  35. 35.39² =
  36. 36.19² =
  37. 37.61² =
  38. 38.91² =
  39. 39.69² =
  40. 40.19² =

Answer key

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

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