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:
1 dozen dots = 10 dots.
Count the existing dots and then draw 10 more circles.
Lesson 2 page 100
Circle a dozen animals (according to the template)
1 dozen = 10 units.
Count all 10 animals and then circle.
Lesson 3 pages 100
Enter a number under each line of the number line:
Count up the numbers from 0 to 10 and then fill in the missing number in the number line.