Math 1 Lesson: A dozen, number rays

### 1.1. Knowledge to remember

– Initial recognition of a tens and the tens-unit relationship:

10 units = 1 dozen

– Number ray, read and write numbers on number ray:

### 1.2. Math Forms about A Tens. Number ray

**Form 1: Relationship between a dozen and 10 units**

Count the number of given objects and draw more or circle to make 1 dozen.

1 dozen = 10 units

**Form 2: Fill in the appropriate number in the number line.**

I determine the distances divided on the number line, the number of equidistant units and then count and fill in the corresponding numbers.

**Form 3: Compare, calculate with 1 dozen.**

Remember: 1 dozen = 10 units đơn

When comparing or calculating 1’s with numbers:

– Convert 1 dozen to units.

– Compare and calculate with numbers.

### 1.3. Solving Textbook Exercises

**Lesson 1 page 100**

Draw more for 1 dozen circles:

**Solution method**

1 dozen dots = 10 dots.

Count the existing dots and then draw 10 more circles.

__Solution guide__

**Lesson 2 page 100**

Circle a dozen animals (according to the template)

__Solution method__

1 dozen = 10 units.

Count all 10 animals and then circle.

__Solution guide__

**Lesson 3 pages 100**

Enter a number under each line of the number line:

__Solution method__

Count up the numbers from 0 to 10 and then fill in the missing number in the number line.

**Solution guide**

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