← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 497 · 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. 2.31² =
  3. 3.91² =
  4. 4.19² =
  5. 5.71² =
  6. 6.61² =
  7. 7.79² =
  8. 8.49² =
  9. 9.91² =
  10. 10.79² =
  11. 11.61² =
  12. 12.81² =
  13. 13.71² =
  14. 14.71² =
  15. 15.31² =
  16. 16.79² =
  17. 17.79² =
  18. 18.49² =
  19. 19.59² =
  20. 20.59² =
  21. 21.49² =
  22. 22.21² =
  23. 23.81² =
  24. 24.81² =
  25. 25.81² =
  26. 26.19² =
  27. 27.19² =
  28. 28.51² =
  29. 29.81² =
  30. 30.81² =
  31. 31.29² =
  32. 32.21² =
  33. 33.69² =
  34. 34.41² =
  35. 35.59² =
  36. 36.39² =
  37. 37.89² =
  38. 38.51² =
  39. 39.39² =
  40. 40.59² =

Answer key

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

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