Tiêu đề Y2 Maths 2013b - 2024 Week 15 Notes.pdf ✅

Year 2 Maths – 2013b Term 2 2024 – Week 7 Notes This is a set of straight forward division sums that requires you to know your 3x table. Take the numbers in the top row and divide each one by 3: 24 ÷ 3 = 9 ÷ 3 = 30 ÷ 3 = What is 24 ÷ 3 ? That means splitting 24 into 3 equal groups. Perhaps an easier way to do this would be to ask yourself: ____ x 3 = 24 You will arrive at the same answer
Let’s try b: _____÷ 4 = 10 Step 1: Do you think the answer is going to be larger or smaller that 10? Why? Step 2: If you reverse the operation, you would get the equation 10 x 4 = ________ You will arrive at the same answer To find the answer that is 10x smaller: Note that your answer has got to be a lot smaller than what you started off with. For example: Make 90 ten times smaller: 90 ÷ 10 • Notice that 90 and 10 both have a zero. All you have to do is remove the zero that is common between the 2 numbers: • 90 ÷ 10 = 9 • But it is always helpful to verify it again by performing a reverse operation : _____ x 10 = 90
Let’ try something more difficult: 800 ÷ 10 = ______ • Notice that 800 has two zeros and 10 has only one zero. When you divide 800 by 10, you should only cancel out ONE ZERO which is common between 800 and 10. • 800 ÷ 10 = 80 • But it is always helpful to verify it again by performing a reverse operation : _____ x 10 = 800 What did you notice about 90 ÷ 10 and 800 ÷ 10? What is long division? Long division is a way to solve division problems with large numbers. Basically, these are division problems you cannot do in your head. Long division helps in breaking the division problem into a sequence of easier steps. There are 2 types of long division • One with NO remainders, • and one with a remainder. TYPE A: NO REMAINDERS Look at this question: 65 ÷ 5 = _______ This is typically not something that you could do in one single step to arrive at the correct answer. Let’s break this down. There are only 4 steps, but they can be confusing. Please pay attention!! Write down the problem in long division format. The bigger number 65 is going to be divided by 5. We call 65 the dividend (something to be divided) and 5 the divisor (the factor that
divides). So let’s look at 65 ÷ 5 again. 65 the dividend goes into the right side of the cover, and 5 the divisor remains outside of the cover on the left. Like this: Step 1: D for Divide For now, let’s split the dividend 65 into 6 and 5.The first problem you’ll work out in this equation is how many times can you divide 5 into 6, or how many times you could take 5 away from 6. If you look at just 6 and nothing else (ignore 65 for the moment), ask yourself how many times could you take 5 away from 6? Just once.. So you put 1 on the quotient line. Step 2: M for Multiply You multiply your answer from step 1 and your divisor: 1 x 5 = 5. You write 5 under the 6. Step 3: S for Subtract Next you subtract. In this case it will be 6 – 5 = 1. Step 4: B for Bring down Now is the time to bring the 5 from the dividend 65 into the picture. This is the last step. You write the 5 next to the 1, making the number 15.