Rounding and Estimation with Decimals

The number 23.456 will be rounded to the nearest tenth and to the nearest hundredth. Choose the correct alternative.

• In both cases we need to round up!

• To round to the nearest tenth we will round down.

• In both cases we need to round down.

• We cannot round to the nearest hundredth because it is already rounded.

Check these numbers below:

55.0, 0.505, 505, 5.05, 0.55. 550.0, 5.5, 0.055

Ordering them from least to GREATEST we will have:

• 0.055, 0.505, 0.55, 5.5, 5.05, 55.0, 55.0 550.0

• 0.55, 0.055, 0.505, 5.05, 5.5, 55.0, 550.0, 505

• 0.055, 0.505, 0.55, 5.05, 5.5, 55.0, 505, 550.0

• 0.055, 0.505, 0.55, 5.05, 550.0, 5.5, 505, 550.0

Josh rounded to the nearest whole the numbers below:

340.753, 8.409, 37.52, 52.31.

Select all the correct rounded numbers.

• 341

• 8

• 37

• 52

Luna drew this number line.

The arrows above represent some decimal numbers. Choose all the decimals represented by the arrows on the number line. Only one is incorrect.

• 5.9

• 6.8

• 6.4

• 5.2

5 hundredths + 7 thousandths + 2 tenths =

• 0.572

• 0.752

• 0.257

• 0.275

Look these 3 decimals on a number line. Choose the wrong statement.

• 0.742 is between B and C

• 0.704 is between A and C

• 0.729 is less than A

• 0.761 is more than C

Rounding each number below,

1.234 and 5.678,

to the nearest hundredth and adding, right after that we will get:

• 6.87

• 6.89

• 6.91

• 6.93

Look at the table above.

Clementine will round all the masses from these animals to the nearest tenth. After rounding each one of them, its sum will be:

• 12.8

• 13.0

• 13.2

• 13.4

Axel bought a pair of socks for $4.25, a t-shirt for $10.75, and a jacket for $24.50. He estimates he will pay :

• $38

• $40

• $42

• $44

• 5.25

• 6.25

• 5.75

• 5.50