Students explore the operations of addition and subtraction. They use estimation, a place value chart, and a calculator to place seven randomly generated numbers in the ones and tens position in a place-value chart to make a sum as close to 100 as possible. https://education.ti.com/en/activity/detail/100-or-bust
This activity allows students to reason about ratio tables, which helps their understanding of what a ratio describes in a context and what quantities in equivalent ratios have in common. https://education.ti.com/en/activity/detail/double-number-lines
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