Expanded Form to 120 with Base 10 Blocks 1-105
Progress from ten frames to more abstract Base 10 blocks. To start, use 10 rods to model 1 group of 100. What's 118? It's 100+10+8 = 1 hundred + 1 ten + 8 ones. When ready, transition to using 1 flat to model 1 group of 100. Notice that 10 rods "fit" on 1 flat. What's 104? It's 100+0+4 = 1 hundred + 0 tens + 4 ones.
