Vocabulary

• open number line - A blank number line on which children can mark points or numbers that are useful for solving problems. Children can use open number lines to record the steps of mental computation strategies. For example: I want to solve 56 + 28. I can start at 56 and jump up 4 ones to get to an easy number, 60. I still have 24 more to go. Next I can jump up two 10s, to 70 and then to 80. Now I just have four more 1s to go, so I hop 4 to 84. So 56 + 28 = 84.

Math Journal (Math Boxes)

Pages 128 & 129

Homework

Home Link 5.11 - Addition Strategies