chances are that students will assume that the word problem at the end will be about addition. But if we start the lesson with a word problem, they will have to think [about the problem] and not ...
This model shows 6 + 3 = 9. You can also use part-whole models to help with addition problems involving bigger numbers. We can partition the smaller number and add the tens and ones separately.
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In addition, Nature publishes other submitted material as detailed below. Articles are original reports whose conclusions represent a substantial advance in understanding of an important problem ...