Counting amounts to 20 with 1 more or less

Counting amounts to 20 with 1 more or less

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Student learn to count to amounts up to 20 with a range of one more or less.

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K.CC.B.5

It is useful to recognize amounts within 1 more or less to make counting faster. You use this when you want to know how many you have or if you want to know which amount is more.

The interactive whiteboard shows objects in different amounts. You can count these together with your students. Encourage the students to use their advanced counting skills, for example skip counting, and to count groups before you count leftover objects. You can check their answers by erasing the grey squares.

The interactive whiteboard has two images of eggs. The first image has 1 egg less than the second. Explain that if you know how many eggs are in the first image, you only have to count on 1 more to know how many eggs are in the second image. The next slide shows two images with blocks. The first image has 1 more block than the second. Explain that if you know how many blocks are in the first image, you only need to count one less to know how many blocks are in the second image. You can continue to show 1 more and less by picking the cherry from the tree to add to the picked fruit, or by dragging the apple core to the trash bin. You can also do this in the class with materials like books or pencils.

To check that students can count 1 more or less while doing exercises you can ask the following questions:

- Where do you see more?

- What is a smart way to count? Skip counting?

What do you do if you have 1 more?

Students practice counting amounts with 1 more or less, with organized amounts. All questions are fill in the blank. The amounts of objects keep getting bigger. Encourage students to use skip counting, and then to count the leftover objects. Emphasize that they are always either counting one more, or one less for the second image in comparison to the first.

Check that students understand counting amounts with 1 more or less and that students are able to put in words that they either count one more or one less from their first number. Emphasize that counting one more or less is easier because you can quickly see which has more or less. Check that students know how to count with 1 more or less by doing the exercise on the interactive whiteboard together. The interactive whiteboard shows two students with an amount of colored pencils. Ask the students to indicate who has more pencils and count the amounts. They do the same with two children with slices of watermelon. Emphasize that they only need to count 1 amount, they can discover the second number by counting either 1 more or 1 less.

For students who are challenged by this goal, ask them to first practice with MAB (multibase arithmetic blocks), and to place one block more, or remove one block from their amount. Students who are comfortable with 1 more or less can be challenged to try 2 more or less.

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Gynzy is an online teaching platform for interactive whiteboards and displays in schools.

With a focus on elementary education, Gynzy’s Whiteboard, digital tools, and activities make it easy for teachers to save time building lessons, increase student engagement, and make classroom management more efficient.