Dennis makes a tile table. He uses 2 boxes of 1,000 red tiles, some boxes of 100 blue tiles, and 8 boxes of 10 green tiles. He uses 3,380 tiles in all. How many boxes of blue tiles does Dennis use?

3,000 red tiles

80 green tiles

3,000+80 = 3,080.

3,380-3,080=300

300 blue tiles.

Im thinking you accidentally put 2 instead of 3 in the ' He uses 2 boxes of 1,000 red tiles' because ive seen this problem before. but if not the answer is 1300 tiles if you meant to put 2.

2000 red plus 80 green equals 2080. 2080 minus 3380 is 1300. 1300 blue tiles divided by 100 equals 13 boxes of blue tile.