Math Before Bed is a collection of images that lend themselves to number talks. Students see a picture of various objects, but find the total in different ways. It allows students to look for patterns, make connections to their classmates' thinking, and even create equations. You can use these in the slides as is for small or whole group discussion, or assign asynchronously with Flipgrid or Jamboard. Check out the full website by Jon Orr for even more goodies!