Estimation of Products

Q.

The smallest natural number which on rounding off to the nearest hundreds will give $400$ is:

1. $399$

2. $401$

3. $499$

4. $350$

Q.

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens): $1,08,734-47,599$

Q.

Round off $90,182$ to the nearest tens, hundred and thousands.

Q. Fill the blank by selecting the best suitable method of estimation.

1. Number of toys sold = 9, 900 (Estimated to nearest tens)
2. Number of toys sold = 9, 900 (Estimated to nearest hundreds)
3. Number of toys sold = 10, 000 (Estimated to nearest hundreds)
4. None of the above

Q.

Estimate the difference by rounding off the number to the nearest hundreds:$900-675$

Q.

Estimate the following:
$89014-52478$

Q.

Estimate the sum to the nearest hundred. $458+324$

Q.

Rounding off each number to the nearest tens before performing the required operation gives more accurate estimate than rounding off each number to the nearest hundreds or thousands.

1. True
2. False

Q.
Estimate the numbers to their nearest tens to find the answer.

1. 1, 800
2. 3, 600
3. 1, 900
4. 3, 800

Q.

Estimate the sum to nearest hundred :

$830+898$

Q. Estimating $125\times 93$ to the nearest tens will give, while estimating to the nearest hundreds will give .

1. $11,700$
2. $10,000$
3. $10,000$
4. $15,000$

Q.
Estimate the numbers to their nearest tens to get the final result.

1. 47, 500
2. 57, 000
3. 57, 600
4. 48, 000

Q.

Round off to the nearest thousand.

$1695\_\_\_\_\_\_\_$

Q.

Estimate the product of $283\times 253$.

Q. For rounding off a number to the nearest ten, the digit in ones place is considered.

1. True
2. False

Q. $132\times 45$ can be estimated to the nearest tens place is .

1. $6500$
2. $6300$
3. $6800$

Q. $151\times 201$ can be estimated to the nearest tens place as:

1. $150\times 210$
2. $160\times 210$
3. $150\times 200$

Q. Fea can fill air in the balloons at the rate of $14$ milliliters per second (mL/s). Estimate the volume of air filled in the balloons by Fea in $3$ minutes.

1. $500$ mL
2. $1,000$ mL
3. $1,500$ mL
4. $2,000$ mL

Q.

Estimate: $(21397+27807+42505)$

Q. Estimating $175\times 121$ to the nearest tens will be more precise than estimating the product to the nearest hundreds.

1. Yes
2. No

Q.

Approximate the following to the nearest lakh.

$32,11,083$

Q.

Estimate the following product :

Q.

Round off the following numbers to the nearest ten thousands.

c) $8,61,392$

Q.

Rounding off the nearest hundred : $2586$

Q.

State whether the following statement is true or false

$400cm:2m::450cm:3km$

1. True
2. False

Q.

Approximate the following to the nearest ten lakh.

$2,88,44,087$

Q.
Whose approach will be closer to the original value?

1. Alan
2. Judy
3. Both of them got the same answer.
4. Cannot be determined

Q. $28\times 32$ can be estimtated to .

1. $900$
2. $1000$
3. $800$

Q.

Approximate the following to the nearest ten lakh.

$3,49,47,110$

Q. Nexus bought 19 biofuel cans, costing 58 cents each. The total cost of the cans to the nearest 10 is .

1. $\$12$
2. $\$10$
3. $\$15$