How many tens and hundreds

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Presentation transcript:

How many tens and hundreds I am learning how many hundreds there are in numbers over 1000. $100 $100 $100 $100 = $1000 $100 $100 $100 $100 $100 $100

We know how many $100 notes there are in $1000. There’s ten. We can use this to work out how many hundred dollar notes there are in $2000. $2000 is twice as big as $1000 so there must be twice as many $100 notes (twenty $100 notes). Let’s check. $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 See the pattern? How many $100 notes must there be in $4000? $100 $100 $100 $100 $100 $100 $100 $100 That’s right. There are forty $100 notes in $1000 $100 $100 $100 $100 $100 $100 $100 $100 $1000 $1000 $1000 $1000

A cricket club wants to buy some more bats. Each bat costs $100 A cricket club wants to buy some more bats. Each bat costs $100. They have $3542 to spend. How many bats can they buy? Step1: We need to find out how many hundred dollar notes there are in $3542. First lets put $3542 in houses. Thousands Hundreds Tens Ones 3 5 4 2 Step 2: How many $100 notes are there in $3000? 30 Step 3: How many $100 notes are there in the hundreds column? 5 Step 4: We don’t need to worry about the numbers in the ones and tens column because they are less than $100 Step 5: Add up how many hundred dollar notes you found. 30 + 5 = 35. This is how many bats they can buy.

A large business wants to buy some new desks. The desks cost $100 A large business wants to buy some new desks. The desks cost $100. They have $6304. How many desks can they buy? Try doing this example in your head. Step1: How many hundreds are there in $6000? 60 Step 2: How many $100 notes are there in the hundreds column? 3 Step 3: Do we need to worry about the numbers in the ones and tens column? No, they are less than $100. Step 4: Add up how many hundred dollar notes you found. 60 + 3 = 63

Now try these questions on your own. How many hundreds are there in the numbers below. Click again when you have completed each question and the answer will be displayed. 8307 2496 5384 2175 7041 80 + 3 = 83 20 + 4 = 24 50 + 3 = 53 20 + 1 = 21 70 + 0 = 70 Need some more practise? Try Pg47 of Teacher Tools Addition and Subtraction Book Numeracy resources