Missing Numbers and Base Ten

Over the past few weeks we have been working in our math classes on the following standards:

1.NBT.1: Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

1.NBT.2: Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
a. 10 can be thought of as a bundle of ten ones- called a "ten."
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
c. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90, refer to one, two, three, four, five, six, seven, eight or nine, tens (and 0 ones).

The students have been  practicing filling in missing numbers on number lines and in a sequence. They have also been working on identifying numbers by looking at base ten blocks and drawing the corresponding base ten blocks for a number. Lastly, they are identifying how many tens and how many ones are in a number and how to group ones into sets of tens.

We are using some vocabulary words for base ten blocks that include calling a hundred a flat, calling a ten a long, and calling a one a cube. When students draw these they use a square to represent a flat, a straight vertical line to represent a long, and a dot to represent a cube.

Here are some examples of drawing base ten blocks:

 

Some of the classrooms have also been working on the vocabulary standard form, word form, and expanded form. Here are some examples of what these words mean:

The students have been working hard to grasp all of these concepts and will have a unit test this week on Thursday and Friday (10/23 and 10/24).

Students will not be switching math classrooms on Wednesdays and therefore will not come home with homework on this day (unless it is a shortened week), however we will be having math next Wednesday because of Halloween on Friday. In addition, we will not be sending home math homework on Fridays.

Have a great rest of your week! :)

Mrs. Bright, Miss Christensen, Miss Gianakakos, and Miss Steimel