advertisement

How many tens and hundreds I am learning how many hundreds there are in numbers over 1000. $100 $100 $100 $100 = $100 $100 $100 $100 $100 $100 $1000 We know how many $100 notes there are in $1000. There’s ten. $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $100 $1000 $1000 $1000 $1000 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. See the pattern? How many $100 notes must there be in $4000? That’s right. There are forty $100 notes in $1000 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. 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. 1) 8307 80 + 3 = 83 2) 2496 20 + 4 = 24 3) 5384 50 + 3 = 53 4) 2175 20 + 1 = 21 5) 7041 70 + 0 = 70 Click again when you have completed each question and the answer will be displayed. Need some more practise? Try Pg47 of Teacher Tools Addition and Subtraction Book Numeracy resources