Base Ten Review

Evaluate each expression and match it with its correct value. 

• 130

• 111+ 881=

• 992

• 30+ 100=

• 129

• 983-233 =

• 750

• 1,000 - 871 =

• 781

• 481 + 300= 

Find the sum:

800+ 70+ 6=

Mathematical Equivalence

ON

Find the unknown in the equation:

7,463 = 7,000 + 400 + (a)   + 3

Answer explanation

To find the unknown in the equation, we need to rearrange it: 5,981 = 5,000 + 900 + __ + 1. Subtract 5,000 and 900 and 1 from both sides: 5,981 - 5,000 - 900 - 1 = __. This simplifies to 80 = __. Therefore, the correct choice is 80.

Organize the following numbers. If the round to 300 when rounded to the nearest hundred put under yes. If it doesn't place under no.

Groups:

(a) Yes

,

(b) No

• 299

• 321

• 390

• 306

• 250

• 221

• 230

What is 435 rounded to the nearest ten?

• 430

• 440

• 450

Answer explanation

The question asks for the number 365 to be rounded to the nearest ten. The options provided are 400, 360, and 370. When rounding to the nearest ten, if the units digit is 5 or more, we round up. Therefore, 365 rounds up to 370, which is the correct answer.

What is 837 rounded to the nearest ten?

• 830

• 840

• 850

Answer explanation

To round 922 to the nearest ten, we look at the digit in the tens place, which is 2. Since it is less than 5, we round down, making the correct choice 920.

What is 675 rounded to the nearest hundred?

• 700

• 600

• 800

Answer explanation

To round 345 to the nearest hundred, we look at the tens digit, which is 4. Since it is less than 5, we round down to the nearest hundred, making the correct choice 300.

What is 987 rounded to the nearest hundred?

• 900

• 1000

• 1100

• 1200

Subtract

900 - 233=

• 667

• 675

• 600

• 766

Find the unknown in the equation:

(a)   = 771- 72