← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 963 · 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. 2.59² =
  3. 3.41² =
  4. 4.19² =
  5. 5.89² =
  6. 6.21² =
  7. 7.39² =
  8. 8.59² =
  9. 9.51² =
  10. 10.21² =
  11. 11.21² =
  12. 12.91² =
  13. 13.69² =
  14. 14.29² =
  15. 15.81² =
  16. 16.51² =
  17. 17.71² =
  18. 18.29² =
  19. 19.31² =
  20. 20.79² =
  21. 21.21² =
  22. 22.19² =
  23. 23.71² =
  24. 24.39² =
  25. 25.51² =
  26. 26.39² =
  27. 27.21² =
  28. 28.79² =
  29. 29.61² =
  30. 30.29² =
  31. 31.69² =
  32. 32.71² =
  33. 33.21² =
  34. 34.19² =
  35. 35.31² =
  36. 36.79² =
  37. 37.61² =
  38. 38.89² =
  39. 39.71² =
  40. 40.39² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths