Or download our app "Guided Lessons by Education.com" on your device's app store.
If your first grader is looking for a number challenge, we've got the worksheet for her. She may be a whiz at adding two numbers together, but can she add three numbers? Adding three numbers horizontally is a great way to practice mental math and addition facts. The problems start out easy, but get progressively harder; if she starts to struggle, just remind her to take each problem two numbers at a time.
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