Subtract 3-Digits from 3-Digits 2 Year 3 Addition and Subtraction Learning Video Clip
Step 16: Subtract 3-Digits from 3-Digits 2 Year 3 Addition and Subtraction Learning Video Clip
Ali the animal keeper is feeding the animals. Make sure the animals receive the correct amount of food by helping Ali with her subtractions.
More resources for Autumn Block 2 Step 16.
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Discussion points for teachers
1.How many nuts does she have left?
Discuss which information is important. How will you record each step of the calculation? What is the best method to use and why? Model how to exchange. Could you use any resources to help?
925 – 239 = 686, 686 – 256 = 430, 430 – 347 = 83. There are 83 nuts left.
2.How many fish should she feed the penguins now?
Discuss how the problem can be solved. Which calculations could be used and why? Discuss how to record each step. How will you know when you have the answer Ali needs?
475 – 189 = 286, 286 – 197 = 89. She should feed them 89 fish now.
3.Which bag should she feed the parrots?
Discuss what the information on the bags represents. How will we know which bag Ali needs? What calculation do we need to do? Why?
617 – 369 = 248g – this is the bag she should use.
4.How much meat is left to collect?
Which is the important information? What does Ali need to know? How will you remember the important information?
612 – 127 = 485, 485 – 119 = 366, 366 – 178 = 188kg left to collect back in.
5.What could her calculation have been and how many hay bales could be left?
Discuss the key facts from the problem. What will each calculation look like? Discuss drawing a blank model of the calculation and filling in the digits systematically. Where can each digit go in the calculation? Are there some positions some digits cannot go in? Why? This question is open-ended for the children to explore.
Various answers, for example: 613 – 427 = 186, 672 – 413 = 259, 641 – 372 = 269, 713 – 426 = 287, 714 – 362 = 352
National Curriculum Objectives
Mathematics Year 3: (3C1) Add and subtract numbers mentally, including:
three-digit number and hundreds
Mathematics Year 3: (3C2) Add and subtract numbers with up to three digits, using formal written methods of columnar addition and subtraction
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