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Calculate sums greater than 100 with 3-digit addends. Use expanded form, the Make 10s and Make 100 addition strategies, adding multiples of 100, and shifting, to find the partial sums and then the total sum -- up to 1,000.
Encourage Base 10 thinking by decomposing numbers into expanded form. Use non-proportional Base 10 discs and ten frames to model quantities and place values concretely. What's 618? 6 hundreds, 1 ten, and 8 ones. Use "nicknames" to emphasize each digit's quantity and place value. "Six hundred, one ten, eight."
Prerequisites: 1-106 ○ 1-105
Generalize from adding tens and ones to adding hundreds. What is 346+200? 300+200 is 3 hundreds + 2 hundreds = 5 hundreds or 500. 346+200 = 546. Think in units of one hundred to make adding multiples of 100 easier.
Prerequisites: 2-85 ○ 1-114
Use Base 10 discs to model and add 3-digit addends with no regrouping. What's 216+423? Group same units together. Add hundreds. Add tens. Add ones. 200+400 = 600, 10+20 = 30, and 6+3 = 9. Add the 3 partial sums to get the total sum. 216+423 = 600+30+9 = 639. Transition to number bonds and equations.
Prerequisites: 2-91 ○ 2-86
