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Question Video: Exploring and Writing Different Addition Expressions to Make 8 Mathematics • 1st Grade

There are lots of ways to make 8. What is the missing expression?


Video Transcript

There are lots of ways to make eight. What is the missing expression? Zero plus eight. One plus seven. Two plus six. What plus what. Four plus four. Five plus three. Six plus two. Seven plus one. And eight plus zero.

There are nine ways to make eight, but one of the expressions is missing. We could use the cube train to help us find the missing expression. We could also find the missing expression by working out the strategy that’s been used. If we look carefully at the pairs of numbers or the number bonds, we can spot some patterns.

If we write down the number of red bricks and blue bricks we’ve used to make eight, that will help us to spot the pattern. What’s happening to the number of red bricks? Zero, one, two, three, four, five, six, seven, eight. The number of red bricks is going up by one each time. We’re counting in ones. Now we found the first missing number. Zero, one, two, three.

What’s happening to the number of blue bricks? Eight, seven, six. The missing number is five. Eight, seven, six, five, four, three, two, one, zero. The number of blue bricks is getting smaller each time; it’s decreasing. We’re counting back in ones, eight, seven, six, five. The missing expression is three plus five. Zero and eight make five, one and seven, two and six, and three and five. So do four plus four, five plus three, six plus two, seven plus one, and eight plus zero.

We found all the ways to make eight using our model and a strategy. We wrote the number bonds down and looked for the pattern. This helped us to find the missing addition expression. Three plus five makes eight.

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