Estimating Products for Reasonable Answers

The video tutorial teaches grade four students how to estimate products to determine if answers are reasonable. It explains the concept of reasonableness and provides examples using real-world scenarios, such as counting tomatoes, selling cookies, calculating savings, and measuring bicycle miles. The video emphasizes rounding numbers for quick multiplication to verify if claims are logical. It concludes with tips on using estimation to check the truthfulness of statements.

What does 'reasonable' mean in the context of estimating products?

• Unfair and impractical

• Fair, practical, and logical

• Complicated and confusing

• None of the above

Tags

CCSS.L.11-12.4C

CCSS.L.6.4C

CCSS.L.7.4C

CCSS.L.8.4C

CCSS.L.9-10.4C

Bob claims his tomato plants produced 73 ripe tomatoes in 4 weeks. Is this reasonable?

• Yes, because 11 rounds to 15

• No, because 11 rounds to 5 and 5 * 4 is 20

• Yes, because 11 rounds to 20

• No, because 11 rounds to 10 and 10 * 4 is 40

How many ripe tomatoes would Bob have if he had 11 ripe tomatoes each week for 4 weeks?

• 73

• 44

• 40

• 50

Tags

CCSS.3.OA.A.3

Talus sold 102 boxes of cookies each week for 3 weeks. Is her total of 306 boxes reasonable?

• Yes, because 102 rounds to 100 and 100 * 3 is 300

• No, because 102 rounds to 110

• Yes, because 102 rounds to 105

• No, because 102 rounds to 90

Tags

CCSS.4.NBT.B.5

If Talus sold 102 boxes of cookies each week for 3 weeks, what is the estimated total?

• 330

• 306

• 320

• 300

Tags

CCSS.4.NBT.B.5

Kate saved $96 a month for 6 months. Is her total of $400 reasonable?

• Yes, because 96 rounds to 90

• No, because 96 rounds to 100 and 100 * 6 is 600

• No, because 96 rounds to 80

• Yes, because 96 rounds to 95

What is the estimated total savings if Kate saved $96 a month for 6 months?

• 700

• 600

• 500

• 400

Amal rode 9 miles each day for a year. Is her total of 3,285 miles reasonable?

• Yes, because 9 rounds to 5

• Yes, because 9 rounds to 10 and 10 * 365 is 3,650

• No, because 9 rounds to 8

• No, because 9 rounds to 7

Tags

CCSS.4.NBT.B.5

What is the estimated total distance Amal rode if she cycled 9 miles each day for a year?

• 2,500

• 3,285

• 3,650

• 3,000

Why is estimation useful when checking if an answer is reasonable?

• It makes the math more complicated

• It helps to quickly determine if an answer is close to the truth

• It is not useful at all

• It always gives the exact answer