3-Digit Numbers and Tens Year 3 Addition and Subtraction Learning Video Clip

Step 5: 3-Digit Numbers and Tens Year 3 Addition and Subtraction Learning Video Clip

The animal park has a busy gift shop. Gift shop Gaz is stocking the shelves ready for the next day.

More resources for Autumn Block 2 Step 5.

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Discussion points for teachers

1.How many pencils will there be when the order arrives?
Discuss what information we need to be able to work out the calculation. Discuss which operation is needed and why. Which column will change and why?
323 + 50 = 373 pencils

2.Which items does he need to order more of?
Discuss the information on the table. Discuss which calculations we need to do first and why. After these calculations, discuss what we need to do next.
316 + 30 = 346, 392 – 40 = 352, 387 – 50 = 337, 324 + 20 = 344, 303 + 60 = 363. He needs to order more postcards, yoyos and pencil sharpeners.

3.After Gaz has stocked up the baskets, how many key rings will be left in the stock cupboard?
Discuss the key information given. Discuss how will you record this information. Discuss which operations we will need to use and why. Discuss whether we need to do more than one calculation and why.
485 – 60 = 425

4.Which combinations of gifts could Gaz stock the shelves with? Discuss the key information given and whether it is all relevant.
Discuss how to work systematically to make sure you list all possibilities. Discuss how to record your list so it is clear and systematic.
7 boxes of butterflies; 1 box of ladybirds and 1 box of grasshoppers; 1 box of ladybirds and 2 boxes of butterflies; 3 boxes of grasshoppers and 1 box of butterflies
2 boxes of grasshoppers and 3 boxes of butterflies; 1 box of grasshoppers and 5 boxes of butterflies; 4 boxes of butterflies and 1 box of grasshoppers

5.What mistake has he made? How many puppets has he got left? Discuss why it is obvious that he has made a mistake.
Discuss how Gaz could have spotted his mistake sooner? Use sentence stems to explain his mistake clearly. How could Gaz ensure he doesn’t make the same mistake again?
Gaz has subtracted 7 ones in stead of 7 tens. He has 119 puppets left.

Optional discussion points:

Make up more of your own problems based in the gift shop. They could be about buying and selling or stocking the shelves.

National Curriculum Objectives

Mathematics Year 3: (3C1) Add and subtract numbers mentally including three-digit number and tens

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