Understanding Rekenrek and Number Sense

Miss McLean introduces the wrecking rack, a tool for teaching counting, addition, and subtraction. She explains how to use it for basic counting, subitizing, and developing automaticity in math. The video covers counting up to 10, beyond 10, and using the rack for addition and subtraction exercises. The goal is to help students recognize numbers quickly and perform math operations without counting each item individually.

What is the primary purpose of a Rekenrek?

• To draw pictures

• To help with math calculations

• To write stories

• To play music

Where should the counters be placed when starting with the Rekenrek?

• On the left side

• In the middle

• At the bottom

• On the right side

What does subitizing mean in the context of using a Rekenrek?

• Counting each object one by one

• Quickly recognizing the number of objects in a set

• Drawing objects

• Writing numbers

How many red and white beads make up 10 on a Rekenrek?

• 6 red and 4 white

• 3 red and 7 white

• 4 red and 6 white

• 5 red and 5 white

What is the result of moving 5 beads and then 5 more beads on a Rekenrek?

• 9

• 11

• 10

• 8

What does automaticity in math mean?

• Drawing pictures quickly

• Adding and subtracting without thinking

• Counting objects one by one

• Writing numbers fast

If you have 7 beads and subtract 2, how many are left?

• 6

• 5

• 4

• 3

What is the result of subtracting 5 from 13 using a Rekenrek?

• 8

• 9

• 7

• 6

What is a key number sense concept for kindergarteners?

• Subtracting numbers up to 20

• Counting to 100

• Adding numbers up to 50

• Understanding 5 and 5 make 10

How can you quickly add up to 20 using a Rekenrek?

• By drawing each number

• By using groups of 10 and adding more

• By counting each bead

• By subtracting from 20