Website: Click Numeration for link to a good website for numeration.
Topic: Abacus Numeration to 100
Material: 100 bead abacus for each student
2 ten-sided (or regular) dice
Outcomes for several lessons:
11 1. Represent and describe numbers to 100, concretely, pictorially and
symbolically.
2. 2. Demonstrate if a number (up to 100) is even or odd.
3. 3. Illustrate, concretely and pictorially, the meaning of place value for numerals to 100.
[C, ME, R, V, T]
Student Friendly Outcomes: I can show all numbers from 0 to 100 on the abacus. I can tell whether a number up to 100 is odd or even. I can show tens and ones on the abacus.
Lesson One
Instructional plan:
Demonstration Lesson
(can be done using the dice on the Smartboard or large demo dice)
The dice are rolled. A student says one of the 2-digit numbers and all students show that number on their abacus. Another student says the other 2-digit number and everyone shows that number on their abacus.
(eg. If a two and a four are rolled, one number becomes a 24 and the other a 42). Continue until all students recognize that there are two possibilities with each roll.
1. Pair students with a partner. Each group will require an abacus for each student and a pair of dice per group.
2. Roll the dice and one student says one of the 2-digit numbers and shows that number on the abacus. The partner says the other 2-digit number and shows that number on the abacus.
(eg. If a two and a four are rolled, one partner
shows 24 and the other partner shows 42).
3. Each student shows their partner the number they made and verbally says the number in tens and ones. (eg. “I have four tens and two ones which is forty-two.”)
Extension: To have the students describe the numbers pictorially and symbolically on paper, they should draw the dice showing the two numbers rolled, illustrate the numbers by drawing tens and ones and print the number
beside the picture. Other suggestions are showing tally marks, using expanded form, etc.
Assessment: Observing during lesson and questioning for understanding.
Assessment: Observing during lesson and questioning for understanding.
