# Lesson guide in Elementary Mathematics 2 Whole Numbers: Addition

Teacher's Guide  |  -  |  PDF

Published on 2011 October 3rd

Description
A learning material that discusses the principles of adding numbers and the different properties of addition including mental calculation and analysis of word problems.
Objective
Be able to perform addition operations, Read money and identify them, Read numbers, perform skip counting, comparing 3 digit numbers and identify patterns of ordinal numbers

#### Curriculum Information

 Education Type K to 12 Grade Level Grade 1 Learning Area Mathematics Content/Topic Numbers and Number Sense Intended Users Educators Competencies Illustrates addition as putting together or combining or joining sets Visualizes and adds two onedigit numbers with sums up to 18 using the order and zero properties of addition Adds two onedigit numbers using appropriate mental techniques eg adding doubles andor neardoubles Visualizes and adds three onedigit numbers using the grouping property of addition Visualizes and adds two to three onedigit numbers horizontally and vertically Uses expanded form to explain the meaning of addition with regrouping Visualizes and adds numbers with sums through 99 without or with regrouping Adds mentally two to three one digit numbers with sums up to 18 using appropriate strategies Adds mentally twodigit numbers and onedigit numbers with regrouping using appropriate strategies Visualizes and solves onestep routine and nonroutine problems involving addition of whole numbers including money with sums up to 99 using appropriate problem solving strategies Creates situations involving addition of whole numbers including money Illustrates subtraction as taking away or comparing elements of sets Illustrates that addition and subtraction are inverse operations Visualizes represents and subtracts onedigit numbers with minuends through 18 basic facts Visualizes represents and subtracts one to twodigit numbers with minuends up to 99 without regrouping Uses the expanded form to explain subtraction with regrouping Visualizes represents and subtracts one to twodigit numbers with minuends up to 99 with regrouping Subtracts mentally onedigit numbers from twodigit minuends without regrouping using appropriate strategies Visualizes represents and solves routine and nonroutine problems involving subtraction of whole numbers including money with minuends up to 99 with and without regrouping using appropriate problem solving strategies and tools Creates situations involving subtraction of whole number including money