compiled by: Mao Miao Miao
Review: Owl
1, Read and write numbers within 20
① Order number: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20;
② Reverse number: 20, 19, 18, 17, 16, 15, 14, 13, 12 ,11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0;
③Singular or odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19;
④Even or even numbers: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20;
⑤Uppercases: zero, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, nineteen, twenty.
2, two-digit
①Full ten: Ten objects as a whole, that is, ten ones, that is, 10, or 10 are 10, and one 10 is 10; for example: 1 10 and 5 1s in 15; or 15 1s in 15;
②Digits: The two-digit number is from right to left, the first digit is the single digit, and the second digit is the ten digits. The unit of counting for single digits is one, and the unit of ten digits is ten. For example: 14, 4 is in the single position, 1 is in the ten position.
3. Reading method
First read the high digits, bring the digits, and then read the low digits in turn, and also carry the digits, such as 14 and 1 are on ten digits, so read as ten, 4 is on single digits, and read as four, and the digits are omitted, so 14 is read as one four, or fourteen.
