Using Place Value to Subtract (Regrouping)

: "Look, Imani! We can use these as furniture!" : "Those are marbles, used in a game." : "Oh, then, teach me how to play, please!" Let's learn about 'Using Place Value to Subtract (regrouping)' to help Mr. Squeaks win the game. There are many strategies to help with subtraction. One of them is using a place value chart. Remember, place value is the value that a number has depending on where it is. When using place value to subtract... ALWAYS start by representing, or showing the first number with tens rods and ones cubes. Then, subtract the second number starting with the ones place... but, what happens if there aren't enough ones to subtract from? You can regroup, or borrow from another place value. We can take a ten from the tens place and move it to the ones place. To do this we must cross off one ten... then move it to the ones place and show it by drawing ten ones. Now we have fourteen ones, and enough to subtract the second number! After this, subtract the second number in the tens place from the first. Here we will subtract zero from the two in the tens place. Finally, count how many tens and ones are left in the place value chart to find the answer! Now that we have learned a bit about place value with regrouping, let's help Mr. Squeaks! While playing, he needs to subtract thirty minus sixteen. Remember, start by representing the first number on the place value chart. We can represent thirty, with three tens and zero ones. Next, subtract the second number from the first by crossing out ones. We have zero ones and need to subtract six, which means we need to regroup! We can do this by crossing out a ten and drawing ten ones in the ones place. Now we can subtract six! After this we need to subtract one ten from the one in sixteen. Finally, we can count how many are left to find our answer! How many marbles did Mr. Squeaks have left? He had fourteen marbles! Mr. Squeaks wants to play again, and this time he needs to subtract thirty-five minus twenty-seven. ALWAYS start by representing, or, showing the first number with tens rods and ones cubes. Thirty-five has three tens and five ones. Next, subtract the second number from the first by crossing out ones. We need to subtract the seven in twenty-seven from the five in thirty-five, but there aren't enough ones... so we must regroup! We need to take one ten from the tens place... and move it to the ones place! Now we can take away seven. After that, we can subtract the two from the tens place. Finally, we can count how many are left to find our answer! How many marbles did Mr. Squeaks have left? He had eight marbles! Before we see if Mr. Squeaks won, let's review. Remember, when using place value to subtract with regrouping... start by representing, or showing the first number with tens rods and ones cubes. next, subtract the second number from the first by crossing out ones. after that, regroup by moving a ten to the ones place. Then, subtract the tens from the second number. Finally, count how many are left to find our answer! And, Mr. Squeaks? Well, he might need help from Imani's beam to get the marbles home.