Four pages on sums that move into a new hundred or reach 1,000. Page 1 asks which hundred a sum will be in before adding. Page 2 estimates a sum, shows 675 + 325 trading in every place to make 1,000, and shows a jump to the next hundred. Page 3 practises the jumps and then estimates and adds six sums. Page 4 explains a zero, checks a wrong answer with an estimate, lines up shorter numbers and asks for a pair that makes exactly 1,000.
Walk the trade chart one row at a time and ask "How many did we get? Can this place hold that many?" Ten flats becoming one big cube makes 1,000 real. Ask for an estimate before every sum on page 3, and use it to check the answer afterwards.
Before your child adds, ask which hundred the answer will be in. Counting on from 596 to 600 and then 3 more is a good way to practise the jump.
This pack supports the following Common Core State Standards for Mathematics:
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
Three-digit sums that cross into a new hundred or reach exactly 1,000, with zeros, chained trades and estimates. Students jump to the next hundred, estimate before adding, explain zeros in a sum and catch a dropped trade.
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