Recognizing to 10 on rekenrek
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Students learn what a rekenrek is and can recognize numbers to 10 on the rekenrek.
Discuss with students that by recognizing numbers on the rekenrek they are able to calculate faster. They don't need to count every bead to know which numbers is being represented. Using the rekenrek also makes it easier to solve adding to/taking from problems.
Show the different numbers on the interactive whiteboard. Point to a number and ask if students know which number it is. Make sure to cover all numbers to 10. Next, say a number and ask students to write the number. Students can hold up their answers to check for understanding.
Explain what a rekenrek looks like. Start with a rekenrek to 10. Show that there are 5 white, and 5 red beads. Discuss how you use a rekenrek. It is important that the red beads are to the left and white beads to the right. Before you use the rekenrek, all beads should be on the right side. Next give an example which shows how you count beads on the left side. There are five red beads and two white beads. Count from 5. There are two more beads, so, 6-7 beads. Next show them a rekenrek to 20. This works just like a rekenrek of 10, but it has an extra row of red and whit beads. Show with the example that counting takes place on the left side as well. 2 red beads on the top row. Count further from 2. There are 2 more beads, so 3-4 beads total. Ask the students if they know how many beads are on the rekenrek. They can choose from a few given options, but must write their answer down.
Check to see if students can recognize to 10 on the rekenrek by asking the following questions:
What does a rekenrek look like?
Are there more red or white beads or are there the same amount?
How do you know which number is on the rekenrek?
Students first practice with exercises in which there are two possible answers. Next they practice with exercises in which a number is given and they must match it to one of two rekenreks. Finally they must write which number is being shown on the rekenrek.
Check that students understand that a rekenrek has rows of ten and groups of five red and five white beads. Emphasize that it is useful to recognize numbers on a rekenrek, to increase calculation speed. Finally students have to indicate how many beads are on the rekenrek and which rekenrek shows 4 beads.
Students who have difficulties recognizing numbers on the rekenrek likely have trouble counting to 10. Let these students practice with the rekenrek counting beads one by one.
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