We know that adjusting numbers can make our mental calculations more efficient. We identified the addend closest to a multiple of ten to support our adding. We know that we must take the one away which we added in the first place.
Adjusting numbers using base ten
![Adjusting numbers using base ten](https://i0.wp.com/www.birkwood.org.uk/website/wp-content/uploads/2023/12/IMG_2163.jpeg?resize=480%2C600&ssl=1)
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