One-year-old math volume 2 100 cognitive exercise 1. On the counter, from the right, the first number is (), the second number is (), and the third number is (). 2.5 The tenth digit is (), while the tenth digit is 100. 3.7 Ten and eight together are (), and six ones and eight tens together are (). 4.92 There are () ones and () tens in it, and () ones and () tens make up 32. 5.74 is () digits, and 74 has () tens digits and () single digits. 6. A three-digit and eight-digit number. This number is (), pronounced (). In 7.57, 5 means 5 () at the () position, and 7 means 7 () at the () position. 8.88 The 8 on the left is in the () position, indicating (), and the 8 on the right is in the () position, indicating that the number before () 9.69 is (), and the number after it is (). The two numbers adjacent to 99 are () and (). 10. The largest two-digit number is (), the smallest two-digit number is (), and their difference is (). 1 1. A number greater than 89 1 is (), and a number less than it 1 is (). 12.60 is larger than () 1 and smaller than () 1. 13. One digit is 5, and the number in the tenth digit is greater than the digit 1. This number is (). 14. Your favorite top ten with six double digits is () () (). 15. Your favorite two-digit unit of 6 is () (). 16. Among the two-digit numbers greater than 45 and less than 60, those with 9 are () and ().

[Understanding of numbers within 100] Improve exercise 1. Find a regular number to write. (1) () () 78 () () 83 () () () () () () 61() () () () (3) 816 () (). (2) When reading and writing numbers, they all start from the position of (). (3) Ten digits are 7, one digit is 6, and this number is (). 83 has () ten and () one. (5) There are () tens in100. (6) The "4" of 48 is in position (), indicating (), while the "8" is in position (), indicating (). (7) The numbers adjacent to 80 are () and (). The adjacent numbers of (8) and 39 are () and (). (9) Write four eight-digit numbers () () (). (10) Write five numbers () () () () () that are greater than the single digits. One digit in (11) 7,51,63,6,17,4,81is (), and the minimum digit is (). The two-digit number is (), where the maximum number is (). (12) is less than 7 1, and the numbers greater than 68 are () and (). (13) The largest number in a number is (), and the smallest number is (). (14) The largest number of two digits is (), and the smallest number is (). (15) 10 one is (), 10 ten is (). 4. Fill in "=", ">" or "

(7)17 () 71(8) 67 () 76 (9)18 () 815. Arrange the following figures in descending order. 33 46 64 98 89 7019 () () () 6. Fill in the blanks 62, 72, 68, 26, 46, 27, 42, 69. The digits are 2 _ _ _ _ _ _ _ _. 7. True or false. The adjacent numbers of (1) and 39 are 40 and 4 1. () (2) The fifth number after 36 is 40. () (3) The position is 1, the position is 6, and this number is 16. () (4) Thirty has thirty ones. () (5) The maximum two digits are 9 1. () (6) The smallest two digits are 1 1. () 8. Write down the number. (2) Two 2-digit numbers, written from 32 to 50. () () () () () () () () () () () () () (3) Five places, from 5 to 50. () () () () () () () () () () (4) 10, from 10 to 100. () () () () () () () () () () () 9. Write the adjacent numbers of each of the following numbers. ( 1)( )28( ) (2)( )60( ) (3)( )93( ) (4)( )59( ) (5)( )4 1( ) (6)( )99( )