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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 151 · 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. 2.89² =
  3. 3.51² =
  4. 4.69² =
  5. 5.69² =
  6. 6.69² =
  7. 7.91² =
  8. 8.71² =
  9. 9.71² =
  10. 10.49² =
  11. 11.31² =
  12. 12.41² =
  13. 13.21² =
  14. 14.89² =
  15. 15.21² =
  16. 16.59² =
  17. 17.49² =
  18. 18.91² =
  19. 19.31² =
  20. 20.19² =
  21. 21.79² =
  22. 22.51² =
  23. 23.41² =
  24. 24.51² =
  25. 25.39² =
  26. 26.69² =
  27. 27.49² =
  28. 28.19² =
  29. 29.71² =
  30. 30.31² =
  31. 31.91² =
  32. 32.19² =
  33. 33.79² =
  34. 34.71² =
  35. 35.79² =
  36. 36.61² =
  37. 37.39² =
  38. 38.91² =
  39. 39.49² =
  40. 40.69² =

Answer key

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

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