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Year 1 Math
任务 80：Two-digit Number Minus A One-digit Number (with Borrowing)
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任务 List
任务 1：Recognizing 0-9 ，addition and subtraction-knowledge
任务 2：Recognizing numbers 1-3
任务 3：Recognizing numbers 4 and 5
任务 4：Recognizing numbers 0
任务 5：＝, ＞ and ＜
任务 6：Exercise 0ne(1)
任务 7：Exercise 0ne(2)
任务 8：Addition
任务 9：Subtraction
任务 10：Exercise Two(1)
任务 11：Exercise Two(2)
任务 12：Recognize the numbers 6, 7, 8, and 9
任务 13：Exercise 0ne(1)
任务 14：Exercise 0ne(2)
任务 15：Addition and subtraction
任务 16：Exercise Two(1)
任务 17：Exercise Two(2)
任务 18：Mixed operations
任务 19：Exercise Three(1)
任务 20：Exercise Three(2)
任务 21：Basic understanding of shapes (Part 1)-knowledge
任务 22：Rectangles, Squares, Cylinders and Spheres
任务 23：Collage of three-dimensional shapes
任务 24：Exercise 0ne
任务 25：Exercise Two
任务 26：Understanding 10 ,Addition and Subtraction-knowledge
任务 27：Understanding 10
任务 28：Exercise 0ne
任务 29：Addition and subtraction of 10
任务 30：Addition and Subtraction Practical Problems
任务 31：Practical problems with unknowns
任务 32：Exercise Two
任务 33：Exercise Three
任务 34：Understanding 11~19-knowledge
任务 35：Understanding 11~19
任务 36：Exercise 0ne
任务 37：Addition and subtraction of 11~19
任务 38：Exercise Two
任务 39：Exercise Three
任务 40：Addition with Carrying and Subtraction with Borrowing-knowledge
任务 41：9 plus the numbers from 1 to 9
任务 42：A number in the teens minus 9
任务 43：Exercise 0ne (1)
任务 44：Exercise 0ne (2)
任务 45：8 or 7 plus a number from 1 to 9
任务 46：A number in the teens minus 8 or 7
任务 47：Exercise Two (1)
任务 48：Exercise Two (2)
任务 49：Addition and subtraction of 6, 5, 4, 3, and 2
任务 50：Exercise Three (1)
任务 51：Exercise Three (2)
任务 52：Review (1)
任务 53：Review(2)
任务 54：Basic Understanding of Shapes (Part 2)-knowledge
任务 55：Understanding 2D Shapes
任务 56：Compare Identical Shapes
任务 57：Equal Parts Figure
任务 58：Exercise 0ne
任务 59：Exercise Two
任务 60：Exercise Three
任务 61：Data Classification (Part 1)-knowledge
任务 62：Classify according to given standards or different standards
任务 63：Represent Results Using Different Methods
任务 64：Exercise 0ne
任务 65：Exercise Two
任务 66：Numbers from 20 to 99-knowledge
任务 67：Place value (within 100)
任务 68：Exercise 0ne
任务 69：The Order of Numbers
任务 70：Number Comparison
任务 71：Exercise Two
任务 72：Exercise Three
任务 73：Exercise Four
任务 74：Addition and Subtraction of Two-Digit Numbers with Tens and One-Digit Numbers-knowledge
任务 75：Addition and subtraction of Two-digit number and Whole Tens
任务 76：Addition and Subtraction of Two-digit and One-digit Number (without Carrying or Borrowing)
任务 77：Exercise 0ne
任务 78：Exercise Two
任务 79：Two-digit Number Plus One-digit Number (with Carrying)
任务 80：Two-digit Number Minus A One-digit Number (with Borrowing)
任务 81：Exercise Three
任务 82：Exercise Four
任务 83：More than or Less than (1)
任务 84：More than or Less than (2)
任务 85：Exercise 0ne
任务 86：Exercise Two
任务 87：Exercise Three
任务 88：Observing Objects (part 1)-knowledge
任务 89：Observe the object from the front, back, left, and right
任务 90：Arrange the pictures in the order of events
任务 91：Exercise 0ne
