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Calculate sums greater than 100 with two, three, or four 2-digit addends. Use expanded form, the Make 10s and Make 100 addition strategies, and adding multiples of 10, to find the partial sums and then the total sum -- up to 1,000.
Practice using all 3 Make 10 strategies. Develop visualization and abstract thinking skills by using pictorial number bonds instead of ten frames. When both addends are greater than 5, any of the 3 strategies can be used. When only 1 addend is greater than 5, use either the Make 10 Left or Make 10 Right strategy.
Prerequisites: 1-44, 1-43, 1-42
Add multiples of 10 by generalizing from the Make 10 strategy to the Make 100 strategy. What's 80+60? First make 100, then add the rest. Think of 60 as 20 and 40. Since 80+20 = 100 and 100+40 = 140, 80+60 = 140. Start by modeling numbers concretely with Base 10 discs and ten frames. Transition to number bonds.
Prerequisites: 1-112
Generalize from making 100 to making 100s – multiples of 100. What's 350+80? First make 400, then add the rest. Think of 80 as 50 and 30. Since 350+50 = 400 and 400+30 = 430, 350+80 = 430. Start by modeling numbers concretely with Base 10 discs and ten frames. Transition to number bonds and equations.
Prerequisites: 2-84 ○ 2-8, 1-112
