4th Grade
MISCELLANEOUS
MENTAL MATH

4th grade
GEOMETRY & FRACTIONS
4th Grade
BE REASONABLE
4th Grade THINKING
100

Round the sum of 4,278 and 3,923 to the nearest thousand. 

8,000

100

5,000 x 40 =

200,000

100

Two lines intersect at a right angle. What do we call those 2 lines?


Perpendicular

100

Without doing the addition, give a reasonable estimate of the sum of the following numbers: 31 + 22 + 19 + 100 + 78

250 OR 260  (30 + 20 + 20 + 100 + 80=250)

100

If the AREA of a square is 64 cm2, what is the measurement of one side? 

8 cm

200

Find the product of 328 x 24 

7872

200

199 x 4 =

796

200

What fraction of a full circle is a right angle? 

1/4 OR 90/360

200

What is a reasonable answer when asked to find the difference between 300,000 and 12,394?

288,000 (would also accept 287,000)

200

Miles went to the candy store with $20 in his wallet. He sees large rainbow lollipops on sale for $3 each. How many large rainbow lollipops can he buy?

20/3 = 6 R2 which means that he can only buy 6 large rainbow lollipops.

300

How much time has elapsed between 3:48pm and 8:12pm?

4 hours 24 minutes

300

530-80 = 

450

300

Picture or draw a right triangle. There are three angles. One is a right angle. What type are the other two?

Acute

300

What is a reasonable answer to 4 x 380

1600 (4 x 400 = 1600)

300

Brian has a collection of 6,225 stamps.  He has 1,500 more stamps than Lecia.  How many stamps do they have altogether?

10,950

400

What is 42 + 52

41
400

1500/300 = 

5

400

Which fraction is larger, 4/6 or 3/9? Prove it using math or a drawing/model 

4/6 (4/6 = 2/3 and 3/9=1/3 so 4/6 is bigger)

400
Give a reasonable estimate to the problem 47 x 3

150

400

Write down all of the factors of the number 63. If any extra or any missing you are wrong.

1,3 ,7 ,9, 21, 63

500

What is the difference between 300,000 and 12,394?

287,606

500

How many minutes are there in one day?

24 x 60 = 1,440

500

Write down two equivalent fractions to 6/9, one greater and one lesser. 

2/3 AND 12/18 OR 18/27 (can go higher to infinity)

500

What is a reasonable answer to 247,000 / 5? 

Around 50,000 (answers of 5, 50, 500 or 5000 are all INCORRECT because multiply any of those by 5 and it's nowhere near 250,000!!)

500

If the perimeter of a square is 40 cm. What is the area?

A = 10 x 10 = 100 cm2 (MUST INCLUDE UNITS FOR ANSWER TO BE CORRECT!)

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