Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
9 Lessons
53 Activities
100 can be thought of as a bundle of ten tens - called a "hundred."
0 Lessons
1 Activity
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).
0 Lessons
0 Activities
Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
11 Lessons
15 Activities
Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and
5 Lessons
12 Activities
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
19 Lessons
146 Activities
Add up to four two-digit numbers using strategies based on place value and properties of operations.
1 Lesson
2 Activities
Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
63 Lessons
97 Activities
Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.
17 Lessons
10 Activities
Explain why addition and subtraction strategies work, using place value and the properties of operations.1
59 Lessons
48 Activities