Post by Suzette Cannonier on Nov 27, 2008 9:28:34 GMT -5
Date: November 7, 2008
Subject: Mathematics
Topic: Number Operation
Sub topic: Subtraction without regrouping
Grade: 4
Age: 9-10
Ability: Mixed
No. of students: 18
No of males/females: 8 males/ 10 females
Time: 45 minutes
Objectives: Children should be able to:
Knowledge
(1) apply strategies to subtract up to 3 digit numbers without regrouping.
(2) Solve two step subtraction word problems without regrouping
Skills: use manipulatives diagrams, symbols to demonstrate and to describe various strategies for subtraction of whole numbers without regrouping
Attitude: show willingness to subtract up to 3 digits without regrouping
Materials: red peas, straws
Previous Knowledge: Children are familiar with subtraction of whole numbers up to 9999 without regrouping. Students are familiar with addition of up to five digit numbers with and without regrouping
Introduction: Teacher introduces the lesson with the song:
Ten green bottle standing on the wall;
If one green bottle accidentally fall,
Then nine green bottles standing on the wall.
Procedure
Step 1: Discuss with students that the inverse of addition is subtraction and vice versa. Teacher engages in discussion with students to solve addition
problems on the chalkboard. (Example 1) ___ - 133 = 456
( Example 2) 7 __5 = a
-4 6__ = b
= __3 4 = c
Step 2: Draw to students’ attention that they have already being given information to work with and they have to use that information to solve the problems. Ensure students are using their manipulatives. (example 456 + 133=589) or b+c=a, a-c=b
Therefore, 589 – 133=456.
Step 3: Have students apply strategy to solve example 2 on chalkboard.
Closure:
Review steps in solving subtraction number and word problems used in the procedure.
Application: Solve the following:
(1) 9 (2) 9 9
-5___ -____
3 6 2 7
(3) ___ - 451 = 240
(4) Tony has 567 marbles left after he gave away 226 marbles. How much Tony had originally?
(5) Sherry had 87 toys. She gave away 10. How many she has left?
Evaluation
Subject: Mathematics
Topic: Number Operation
Sub topic: Subtraction without regrouping
Grade: 4
Age: 9-10
Ability: Mixed
No. of students: 18
No of males/females: 8 males/ 10 females
Time: 45 minutes
Objectives: Children should be able to:
Knowledge
(1) apply strategies to subtract up to 3 digit numbers without regrouping.
(2) Solve two step subtraction word problems without regrouping
Skills: use manipulatives diagrams, symbols to demonstrate and to describe various strategies for subtraction of whole numbers without regrouping
Attitude: show willingness to subtract up to 3 digits without regrouping
Materials: red peas, straws
Previous Knowledge: Children are familiar with subtraction of whole numbers up to 9999 without regrouping. Students are familiar with addition of up to five digit numbers with and without regrouping
Introduction: Teacher introduces the lesson with the song:
Ten green bottle standing on the wall;
If one green bottle accidentally fall,
Then nine green bottles standing on the wall.
Procedure
Step 1: Discuss with students that the inverse of addition is subtraction and vice versa. Teacher engages in discussion with students to solve addition
problems on the chalkboard. (Example 1) ___ - 133 = 456
( Example 2) 7 __5 = a
-4 6__ = b
= __3 4 = c
Step 2: Draw to students’ attention that they have already being given information to work with and they have to use that information to solve the problems. Ensure students are using their manipulatives. (example 456 + 133=589) or b+c=a, a-c=b
Therefore, 589 – 133=456.
Step 3: Have students apply strategy to solve example 2 on chalkboard.
Closure:
Review steps in solving subtraction number and word problems used in the procedure.
Application: Solve the following:
(1) 9 (2) 9 9
-5___ -____
3 6 2 7
(3) ___ - 451 = 240
(4) Tony has 567 marbles left after he gave away 226 marbles. How much Tony had originally?
(5) Sherry had 87 toys. She gave away 10. How many she has left?
Evaluation