Unit 9: Numbers Through 1,000 Summary
This unit focuses on counting, representing, comparing, and ordering numbers from 500 through 1,000. Although students can count aloud and write numbers, they now extend their understanding by modeling greater numbers with base-10 blocks and learning to read and write number words, using their number and symbol card deck. Students learn to see the connections between the number 325, the number words three hundred twenty-five, and the representation of the number in expanded form (325 = 3 hundreds + 2 tens + 5 ones or 325 = 300 + 20 + 5). As students work with these representations, they develop a deeper understanding of how our base-10 number system works. Fully understanding the number system builds confidence and skills that will help them solve problems involving greater numbers. The understanding of multiple representations of numbers and place value also leads students to create strategies for comparing numbers through 1,000 and for properly using the greater-than (>), less-than (<), and equal-to (=) symbols. During this unit, watch for mistakes as students count. Have students count forward and backward, starting with numbers greater than 500 up through 1,000. Make sure they count at least 10 numbers and cross over multiples of ten or one hundred (for