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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 134 · 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. 2.41² =
  3. 3.21² =
  4. 4.71² =
  5. 5.39² =
  6. 6.49² =
  7. 7.59² =
  8. 8.61² =
  9. 9.91² =
  10. 10.39² =
  11. 11.51² =
  12. 12.49² =
  13. 13.59² =
  14. 14.59² =
  15. 15.21² =
  16. 16.29² =
  17. 17.51² =
  18. 18.41² =
  19. 19.19² =
  20. 20.81² =
  21. 21.71² =
  22. 22.71² =
  23. 23.89² =
  24. 24.51² =
  25. 25.61² =
  26. 26.21² =
  27. 27.79² =
  28. 28.59² =
  29. 29.61² =
  30. 30.71² =
  31. 31.51² =
  32. 32.39² =
  33. 33.71² =
  34. 34.21² =
  35. 35.59² =
  36. 36.79² =
  37. 37.69² =
  38. 38.31² =
  39. 39.79² =
  40. 40.91² =

Answer key

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

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