Four images across: 23% + 1% times 4 = 96%.Three images across: 30% + 1% times 3 = 99%.It's best to fold in a little extra wiggle room, just to make sure. Now decide how much of that amount you want to be image, and how much you want to be margin. That gives you the width of the image AND its margin-right. Divide 100% by the number of images you want to tile across. What if you want to tile more than three across? Then it's time to do math. To Place More Than Three Pictures Side-by-Side Three pixels on a mobile phone take up a lot more screen real estate than three pixels on a large computer monitor. Like percentages, ems grow and shrink depending on screen size, whereas pixels are fixed. Because webpages can scroll off the bottom of the page, we can't really specify vertical layout in percentages, so I cheated and specified the vertical space in ems. margin-bottom is the whitespace below each graphic.You can play with this number if you need to.
Since I don't know how wide your device's screen is, I made the margin 1%.
margin-right is the whitespace to the right of each graphic. If you string a bunch of pictures together with float, and they're each 30% of the available space, they'll wrap around after the third image on each row. 30% restricts its width to 30% of the column. float means "squeeze the picture as far to the left as it will fit if there's not enough line, wrap around until there is room." Basically, it makes a graphic behave exactly the way a letter of text does when you type it on a computer screen. (The line of code I gave you already says how you want the image to be displayed.) style ="blah" means "And here's how I want it to display on the page." Style is also used for font colors, sizes, and anything to do with layout or appearance. (Your image's URL replaces the word blah.) img src="blah" is the placeholder for "Stick an image here. Tap Crop and select the part of the page that you want to insert. On the toolbar, tap Expand Insert photo. 
At the top, click the tabs to search for an image or choose an image from Google Drive or Google Photos. Search for an image on the web, or tap the camera to use the Jamboard camera. Tap Take photo again to capture and insert the photo. To take a picture with the board's camera, tap Take photo. Tap a search result, then tap Crop to select part of the web page. Then tap Insert. Use the keyboard to enter a term, then tap Search. 
To search for an image, tap Image Search. On the toolbar, tap Choose image one of the following tools:. You can search for images in a jam as well as add photos or insert a screenshot of a webpage to a jam.
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