← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 186 · 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. 1.29² =
  2. 2.31² =
  3. 3.79² =
  4. 4.19² =
  5. 5.41² =
  6. 6.79² =
  7. 7.21² =
  8. 8.89² =
  9. 9.29² =
  10. 10.29² =
  11. 11.79² =
  12. 12.89² =
  13. 13.39² =
  14. 14.89² =
  15. 15.71² =
  16. 16.91² =
  17. 17.29² =
  18. 18.61² =
  19. 19.39² =
  20. 20.19² =
  21. 21.49² =
  22. 22.79² =
  23. 23.49² =
  24. 24.61² =
  25. 25.71² =
  26. 26.19² =
  27. 27.91² =
  28. 28.39² =
  29. 29.51² =
  30. 30.51² =
  31. 31.19² =
  32. 32.69² =
  33. 33.69² =
  34. 34.89² =
  35. 35.91² =
  36. 36.41² =
  37. 37.79² =
  38. 38.91² =
  39. 39.31² =
  40. 40.29² =

Answer key

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

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