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Heather Robinson

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WALT: Work out subtraction problems by counting back

WALT: Work out subtraction problems by counting back Thursday 10:30am Maths WALT: Work out subtraction problems by counting back Another way to work out subtraction problems is to count back in your head from the bigger number. You may have done this before when adding two numbers together. Remember that when we subtract/take away we count backwards and the number gets smaller. Have a go at following the instructions below to work out the subtraction problems using this strategy. There are voice recorded instructions for you to follow and Zeng from Whales class has made a video to show you what it looks like when you do it. When you use this strategy remember to: 1. Hold the bigger number in your head 2. Use your fingers to make the smaller numbers 3. Nod for the number you are starting on to help you remember to start your counting back by the number before (Just like you did when you used your numberline) 4. You can check your counting by doing the same subtraction problem on your numberline using the strategy from yesterday or by counting out and taking away objects. It is always great to check your counting, If this is a bit too tricky for you don't worry. Just watch the video so you can see how it's done and then go back to yesterday's strategy: Counting back by making jumps on the numberline and do some more subtraction problems on there. Please post your work as a new/separate post on your journal. Have fun :) Remember- don't spend too long on the task and take a break when you need to :)

1st Grade, Kindergarten, Math
11 teachers like this
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