Students continue to develop the major concepts addressed in Unit 1 related to counting and recognizing quantities.
Unit 2 emphasizes combinations of numbers that make 5, and also introduces the process of comparing quantities within 10.
Through work with the two-color five-frames, students will begin to develop the combinations of 5 (such as 0 + 5 = 5, 1 + 4 = 5, 2 + 3 = 5).
Although we express these combinations in the forms of equations, the emphasis is not on the operation of addition or fact mastery, though these experiences set a solid foundation for both adding and subtracting. Rather, the emphasis at this time is on understanding that a single quantity, in this case 5 (later 10), can be decomposed into smaller component quantities, such as 1 and 4.
Below are resources to further explain:
A Lesson on How to Make Combinations of 5 with Red and Blue Counters on a Fives Frame
Composing and Decomposing Pattern Block Shapes (A video that further explains how.)
Below are the tools we use when practicing counting and "seeing" numbers up to 10:
Fingers -
Poster for Using Fingers to Show Numbers
Tally Marks-
Rhyme for remembering tally mark numbers:
"1,2,3,4, wait…. number 5 makes a gate.
6,7,8,9, wait… number 10 makes another gate!"
(It is important for students to show the number on their hand when saying each number while chanting the rhyme. **See "Poster for Using Fingers to Show Numbers" above.)Home Connection Pages: 35, 37, 47, 48, 49, 53, 54Tens Frame -
Because Kindergartners are still solidifying one-to-one correspondence and cardinality, counting by ones is just fine to start. However, many students will begin to employ more efficient strategies that begin leading them toward addition. For example, some will start at a known number and then count up. Others will begin to see combinations and, in effect, add to determine the total.
Home Connection Pages: 17, 19, 21, 31, 32, 34Graphing (Tower of Ten)-
This is just a Tens Frame that has two fives on top of each other vertically instead of 2 rows of five , so it can be used the same way.
Home Connection Pages: 39, 40Number Rack -
NUMBER RACK VIDEO- (A video that demonstrates how to use a number rack, watch up to about 2 minutes.)
NUMBER RACK APP- (A digital number rack for student use at home.)
Activities to do with the Number Rack:
Tell a story problem and have your child show it on the rack.
Ask your child to use it to show and tell their own story problem.
Answer addition and subtraction equations.
Give a number to 10 and have your child push that number with only 1 push. IE. Show me 6. That could be 5 red and 1 white and push all together (1 push) instead of pushing 5 red first and then 1 white (2 pushes) or 6 total pushes.
Give a number and ask how many more to make 5.
Give a number and ask how many more to make 10.
Write equations to match!
How Many: Identify how many items or empty squares there are.
Build: Drag a certain number of items to the frame.
Fill: Determine how many items are needed to fill the remaining squares.
Add: Drag items to complete addition problems.
Chose five or ten frames to flash on the screen for a set time limit. Then, type the number that was shown.
~Watch carefully! After the timer runs out, enter the correct number to proceed to the next flash. The timer decreases with each correct answer and increases with each incorrect answer. At the end of the interactive, data is displayed showing the incorrect and correct answers and what time limit the slide was in view.
Drag and drop virtual pattern blocks: arrange blocks to create designs, build sequences, or fill in a puzzle (similar to a tangram puzzle).
View a set of tally marks and type in the number represented, from 1-10. Tally Marks Up to 20 provides an additional challenge for students.