Math Tricks for Adding Large Numbers

The video tutorial demonstrates a simple trick for adding and subtracting larger numbers by rounding them to the nearest multiples of 10. It provides three examples: adding 45 and 56, adding 128 and 40, and subtracting 235 and 40. The method involves rounding numbers up or down, performing the arithmetic, and then adjusting the result by adding or subtracting the difference. This approach simplifies calculations and makes math easier. The video concludes with a call to subscribe for daily math and science content.

What is the main idea introduced for simplifying addition of large numbers?

• Using a calculator

• Rounding numbers to the nearest multiple of 10

• Breaking numbers into smaller parts

• Using a number line

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CCSS.3.NBT.A.1

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In the first example, what number is 45 rounded up to?

• 55

• 60

• 50

• 40

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CCSS.5.NBT.A.4

After rounding 56 to 60, what is the next step in the first example?

• Add 10

• Subtract 4

• Add 5

• Subtract 9

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CCSS.3.NBT.A.1

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In the second example, what is 128 rounded up to?

• 130

• 135

• 140

• 120

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CCSS.2.NBT.B.7

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What is the result of adding 130 and 40 in the second example?

• 160

• 150

• 170

• 180

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CCSS.3.NBT.A.1

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In the third example, what is 235 rounded down to?

• 225

• 220

• 240

• 230

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CCSS.5.NBT.A.4

What adjustment is made after rounding 235 and 40 in the third example?

• Add 6

• Subtract 11

• Add 11

• Subtract 6

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the final result of the subtraction example?

• 290

• 281

• 270

• 260

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CCSS.2.NBT.B.7

CCSS.3.NBT.A.2