Write the numbers as the sum of hundreds, tens, and units
1.1. Knowledge to remember
Write the number as the sum of hundreds and tens of units and vice versa.
1.2. Math forms
Form 1: Write the number as the sum of hundreds, tens, and units.
Parse the given number into the sum of the rows.
Type 2: Find the preceding number (or the number following) of a number and then write that number as a sum.
Step 1: Find the number to sum.
+) The preceding number of a is one unit less than a; The next number of a has a value of one more than a
+) Even numbers are numbers whose units are equal to one of the numbers 0, 2, 4, 6, 8. An odd number is a number whose units are equal to one of the digits 1, 3, 5, 7 and 9.
+) The largest three-digit numbers, the largest three-digit even number has the hundreds digit as 9; The smallest three-digit number is usually 1 .
Step 2: Write the number you just found as the sum of hundreds, tens, and units.
Form 3: Compare numbers within 1000
Compare two or more three-digit numbers in the order of rows from left to right.
1.3. Solving Textbook Exercises
Write (in the form):
Parse the given three-digit numbers into hundreds, tens, and units.
Write the numbers 271, 978, 835, 509 according to the pattern:
Model: 271 = 200 + 70 + 1
Break down the given three-digit numbers into hundreds, tens, and units and write the pattern.
271 = 200 + 70 + 1
978 = 900 + 70 + 8
835 = 800 + 30 + 5
509 = 500 + 9
What sum is each 975, 731, 980, 505, 632, 842 written into?
Match the three-digit number with the appropriate sum of hundreds, tens, and units.
Arrange 4 triangles to form a boat (see picture):
Using triangles, rotate and make a boat shape.
It can be arranged as follows: