Counting organized amounts to 100

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Students learn to count structured amounts to 100.

1.NBT.A.1

Explain that it is important to be able to count to 100, so you know how much of something you have. You also need this to be able to work with numbers.

Have students count by throwing a ball to each other and counting up at every toss. Start them by naming a number (below 100) and then throwing the ball to a student who has to say the next number, and repeat. You can make this more challenging by having students skip count in 2s, or 5s.

The interactive whiteboard shows seven jars with 5 marbles and two loose marbles. Use this image to discuss skip counting in 5s, and demonstrate skip counting in 5s before counting the two remaining marbles. Have students repeat this out loud. This can be repeated with the cakes and pretzels, also using skip counting in 10s. Next show different kinds of groups of five and ten. To check that students can count amounts, count the books, pumpkins and erasers together. Discuss with students what the order of counting should be. Next three amounts of objects and three numbers are given. The students need to determine which number fits with which amount and must draw a line to connect them.

To check that students can count organized amounts to 100, you can ask the following questions:

- Which number do you start at?

- How do you count from 1 to 10?

- How many objects are there?

Students first practice skip counting in 10s with the objects clearly grouped in 10s and answer a multiple choice question. Next they practice skip counting in 5s with the objects clearly grouped in 5s and answer a multiple choice question. Finally they skip count in 10s with objects in boxes and answer an open question. Encourage students to skip count out loud. Emphasize that they should skip count the groups first and then count the remaining objects.

Check that students are able to count organized amounts to 100. Repeat that it is important to be able to count to 100, so they can count how many of something there is. To check that they can count organized amounts to 100, discuss the exercise on the interactive whiteboard with the students. Students must drag the correct amount to the given number. Encourage students to first drag the groups of 10 and then the remaining objects.

Students who still have difficulty counting to 100 should be encouraged to practice saying & writing the numbers on the number line to 100. They can also practice skip counting in 2s, 5s, and 10s.

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