November+13

Complements "Making Ten"
Students who do not know what two numbers make ten have the most difficulty in mastering addition facts. Once learned at an automatized level, other addition facts become relatively easy. Each complement can be written (or said) in 4 ways 1+9 = 10, 9+1 = 10, 10 = 1+9, 10 = 9+1 Students over practice 1,9 ; 2, 8 ; 3,7 ; 4,6 ; 5,5 Students explore the complements of 20 and overpractice Students create "Tests" for each other with complement questions. Students explore complements for 30, 40, 50, 60, etc. Work Sheet for next day.