Exploring the Powers of 10 Strategy for Product Reasonableness

What does the expression 'in the ballpark' mean in the context of solving math problems?

• The answer is completely wrong.

• The answer is exactly correct.

• The answer is close to being correct.

• The answer is unrelated to the problem.

What is the first step in the powers of 10 estimation strategy?

• Round each factor to the nearest power of 10.

• Divide the factors by 10.

• Multiply the factors directly.

• Add the factors together.

Tags

CCSS.5.NBT.A.2

In the three-step strategy, what do you do after rounding each factor to the nearest power of 10?

• Subtract the factors.

• Compare the estimate to the product.

• Divide the product by 10.

• Solve the extended math fact.

What is the estimated product of 492 and 63 when rounded to the nearest powers of 10?

• 40,000

• 50,000

• 30,000

• 60,000

Tags

CCSS.4.NBT.B.5

Why was the estimate of 30,000 not close to the actual product of 480,992 in the first example?

• The factors were not rounded correctly.

• The product was miscalculated.

• The multiplication was done incorrectly.

• The strategy was not followed properly.

Tags

CCSS.4.NBT.B.5

What is the estimated product of 72 and 689 when rounded to the nearest powers of 10?

• 49,000

• 60,000

• 50,000

• 40,000

Tags

CCSS.4.NBT.B.5

Why was the estimate of 49,000 not close to the actual product of 490,608 in the second example?

• The factors were not rounded correctly.

• The multiplication was done incorrectly.

• The strategy was not followed properly.

• The product was miscalculated.

Tags

CCSS.4.NBT.B.5

What is the estimated product of 1182 and 291 when rounded to the nearest powers of 10?

• 360,000

• 320,000

• 300,000

• 400,000

Tags

CCSS.4.NBT.B.5

Why was the estimate of 360,000 considered close to the actual product of 324,096 in the final example?

• The estimate was exactly correct.

• The factors were not rounded correctly.

• Both numbers are in the hundred thousands place.

• The product was miscalculated.

Tags

CCSS.4.NBT.B.5

What is the final step in the powers of 10 estimation strategy?

• Multiply the factors directly.

• Solve the extended math fact.

• Round each factor to the nearest power of 10.

• Compare the size of the estimate to the product.

Tags

CCSS.4.NBT.B.5