Decomposing Twice Lesson 2.18:.

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Presentation transcript:

Decomposing Twice Lesson 2.18:

Application Problem Jolene brings an apple and an orange with her to school. The weight of both pieces of fruit together is 417 grams. The apple weighs 223 grams. What is the weight of Jolene’s orange?

Guided Instruction Concept Development: Problem 1 In the Application Problem, Jolene’s apple weighs 223 grams and her orange weighs 194 grams. Look at the tape diagram. What does the question mark in these tape diagrams represent? How much heavier the apple is than the orange. How much more the apple weighs, in grams?

Guided Instruction Concept Development: Problem 1 Tell a partner what equation you can use to find out how much heavier the apple is than the orange. Write the equation vertically on your board. Before we subtract, what needs to be done? We need to make sure we can subtract each place. We have to see if any tens or hundreds need to be unbundled.

Guided Instruction Concept Development: Problem 1 Do we have enough ones to subtract? No. We need to change a ten for 10 ones. Can we subtract in the tens place? No. We also need to change a hundred for 10 tens. Then we can solve.

Guided Instruction Concept Development: Problem 1 Unbundle or change the ten. How many tens and ones do we have now? 1 ten and 13 ones Now unbundle or change the hundred. How many hundreds and tens do we have now? 1 hundred and 11 tens

Guided Instruction Concept Development: Problem 1 Are we ready to subtract? Solve the problem in your notebook. How much heavier is the apple than the orange? The apple is 29 grams heavier than the orange!

Guided Instruction Concept Development: Problem 1 Get the problems ready for subtraction by unbundling all necessary digits before performing the operation. 342 cm – 55 cm 764 g – 485 g 573 mL – 375 mL How are the subtraction problems we’ve solved so far different than those we solved yesterday? Yesterday, we only had to unbundle once. Today, we had to unbundle twice.

Guided Instruction Concept Development: Problem 2 Kerrin has 703 milliliters of water in a pitcher. She pours some water out. Now, 124 milliliters are left in the pitcher. How much water did Kerrin pour out? Draw a tape diagram to represent this problem. Solve this problem using the algorithm. What needs to be done first? We need to unbundle a ten.

Guided Instruction Concept Development: Problem 2 What digit is in the tens place on top? Can we unbundle 0 tens? Where can we get tens? We can change 1 hundred into 10 tens! Change the hundred into tens on your board.

Guided Instruction Concept Development: Problem 2 How many hundreds and tens does the top number have now? 6 hundreds and 10 tens Why aren’t we ready to subtract yet? Finish unbundling in your notebook and complete the subtraction. How many milliliters of water did Kerrin pour out? She poured out 579 milliliters of water.

Guided Instruction Concept Development: Problem 2 Students should ready their problems for subtraction by unbundling all necessary digits before performing the operation. 703 cm – 37 cm 700 mL – 356 mL 500 g – 467 g

Exit Ticket 1. Solve the subtraction problems below. a. 346 m − 187 m b. 700 kg − 592 kg 2. The farmer’s sheep weighs 647 kilograms less than the farmer’s cow. The cow weighs 725 kilograms. How much does the sheep weigh?

Math Log Why is it important to unbundle or change all of your units before subtracting?