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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 745 · 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. 1.49² =
  2. 2.69² =
  3. 3.21² =
  4. 4.69² =
  5. 5.79² =
  6. 6.61² =
  7. 7.49² =
  8. 8.89² =
  9. 9.19² =
  10. 10.21² =
  11. 11.59² =
  12. 12.31² =
  13. 13.59² =
  14. 14.79² =
  15. 15.61² =
  16. 16.81² =
  17. 17.49² =
  18. 18.71² =
  19. 19.71² =
  20. 20.39² =
  21. 21.89² =
  22. 22.61² =
  23. 23.79² =
  24. 24.71² =
  25. 25.29² =
  26. 26.89² =
  27. 27.79² =
  28. 28.29² =
  29. 29.81² =
  30. 30.61² =
  31. 31.89² =
  32. 32.41² =
  33. 33.51² =
  34. 34.71² =
  35. 35.89² =
  36. 36.79² =
  37. 37.19² =
  38. 38.89² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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