MENTAL MATH
80 X 90
7,200
What is 0 divided by 4?
0
Math Concept:
- O divided by any nonzero number is 0.
- Any number divided by 0 is undefined.
What is the identity element of multiplication?
1
(One)
Identify the property of multiplication in
96 x (25 + 12 ) = ( 96 x 25 ) x ( 96 x 12 )
DPMA
Distributive Property of Multiplciation over Addition
1200 ÷ 40
30
What is the place value of digit 8 in 187,250,945?
ten millions
In 370 ÷ 6 = 61 r. 4, what is the divisor?
6
What is the place value of digit 3 in 25.047683?
millionths
510 + 520 + 530 + 540 + 550
N = 1 + 1 + 1 + 1 + 1
N = 5
What is the sum of the values of digit 5 in 85,250?
N = 5,000 + 50
N = 5,050
What is the number which is 15 more than 33?
N = 15 + 27
N = 42
What is the average of the first 7 natural numbers?
N = ( 1 + 2 + 3 + 4 + 5 + 6 + 7 ) ÷ 7
N = 28 ÷ 7
N = 4
3 + 24 ÷ 3 X 5 - 35
N = 3 + 8 x 5 - 35
= 3 + 40 - 35
= 43 - 35
N = 8
What is the smallest number that can be rounded off to 200?
150
What is the result if the product of 12 and 5 subtracted from 200?
N = 200 - (12 x 5)
N = 200 - 60
N = 140
Larry has ₱12,000. After spending some equal amount of money in seven days, he has ₱1,850 left. How much did he spend each day?
N = (₱12,000 - ₱1,850) ÷ 7
N = ₱10,150 ÷ 7
N = ₱1,450
200 - 199 + 198 - 197
N = 1 + 1
N = 2
What is the result if 47 tens is added from 47 hundreds?
N = 470 + 4,700
N = 5,170
Victor is thrice heavier than Ronald, and Arnold is 10 kg heavier than Ronald. The sum of their weight is 80 kg. What is the weight of Arnold?
24 kg
Aaron has the following grades in English test: 87, 85, 95 and 92. What must be his grade for the next test if he wants to get an average of 90 for the 5 tests?
Total Scores: 90 x 5 = 450
Total Scores of the 4 tests: 87 + 85 + 95 + 92 = 359
Needed score for the 5th test:
N = 450 - 359
N = 91