Counting Up Subtraction for 3rd Graders

What materials are needed for the lesson?

• Laptop and notebook

• Textbook and colored pencils

• Calculator and math journal

• Whiteboard, marker, eraser, math journal, and pencil

What does 'sum' refer to in mathematical terms?

• Addition

• Division

• Multiplication

• Subtraction

How do you estimate the sum of 76 and 24 by rounding?

• Round to 80 and 20, then add

• Round to 70 and 20, then add

• Round to 70 and 30, then add

• Round to 80 and 30, then add

What is the estimated difference when subtracting 21 from 49 after rounding?

• 10

• 40

• 20

• 30

What is the counting up strategy in subtraction?

• Dividing the larger number by the smaller

• Adding numbers until reaching the minuend

• Subtracting numbers from zero

• Multiplying small numbers

How much is 56 minus 24 using the counting up method?

• 28

• 30

• 34

• 32

Which subtraction method was compared with counting up?

• Traditional subtraction

• Division

• Addition

• Multiplication

What is the result of 343 minus 158 using traditional subtraction?

• 180

• 175

• 195

• 185

What should you do on page 73 of the math journal?

• Write a short essay

• Solve problems using counting up and check estimates

• Draw shapes

• Color the diagrams

What is the estimated result of 91 minus 46?

• 45

• 50

• 40

• 55