Counting backward from 100

Students learn to count backward from random numbers up to 100.

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Students learn to count backward from random numbers up to 100

CCSS.Math.Content.K.CC.A.1

Students will be able to count backward from random numbers up to 100.

Students have a fun quiz to start the lesson. They must answer a number of questions from the interactive whiteboard. Have them write their answers on a mini whiteboard or sheet of paper and hold up their answers so that you can check their work. Say a few of their correct answers out loud.

Together with students, count from 100 to 91 while pointing at the numbers in the counting sequence. Next show the numbers 81 to 90. Have the class count this row backward out loud as well. Continue counting back with the following rows back to 50. Have students form pairs and practice counting backward together. They must write a number between 1 and 100. They they must both count backward from the larger of the two numbers to the smaller of the two numbers. Then the students are asked to drag the numbers to where they belong in the counting sequence. Ask students how they know where the given numbers belong. Point out that the right set starts with an 8 and that the numbers that start with an 8 belong there. Next ask students to fill in the missing number. They can write their answers on a sheet of paper and hold it up to check their work.

Check that students are able to count backward from numbers to 100 by asking the following questions:

- How do you count backward?

- Which number comes before 81?

- Which number comes before 69?

Students are given exercises in which they must count backward from numbers up to 100. They are first shown shorter counting sequences and then progressively longer sequences.

Discuss with students that it is important to be able to count backward from 100, because you need to be comfortable with numbers to do math problems. Check that students are able to count backward from 100. Ask students to form groups and have them take turns counting backward from the starting number to the final number. When they finish counting, the group stands up. Which group is fastest at counting backward?

Students who have difficulty counting backward can be supported by counting out loud. They can also be supported by counting forward before counting backward, or by making use of a number line.

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