Topical Review (1a)

Look at the diagram.

How many cubes are there?

(a)  

915 = 9 ​ (a)   ​​ 1 ​ (b)   5 ​ ​ (c)  

• hundreds
• tens
• ones

697 - 300

(a)  

168 + 350

(a)  

Arrange the numbers in order. Begin with the greatest.

​ (a)   , ​ (b)   , ​ (c)  

• 521
• 251
• 215

Look at the number pattern below.

What is the missing number?

336, 334, 332, 330, (a)   , 326

Answer explanation

Rule : -2 after every number

330 - 2 = 328

Look at the sum.

What is the missing digit in the box?

(a)  

Answer explanation

792 - ? = 573

792 - 573 = 219

So, missing digit is 1

Or you can do the renaming.

Subtract 231 from 800.

(a)  

Answer explanation

800 - 231 = 569

Form the greatest 3-digit even number using the digits below.

​ (a)   ​ (b)   ​ (c)  

• 8
• 3
• 4

Answer explanation

Arrange the digits from the greatest to the smallest.

843

But, the digit in the ones place is not even (0, 2, 4, 6, 8)

So, swap the ones and tens place : 834

A fruit seller has 418 red apples and 570 green apples.

How many red and green apples does he have in all?

(a)  

Answer explanation

Find altogether, so we add.

418 + 570 = 988