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Below are the examples on** mental math addition**

Step 1: Add the two ones' place digits: 6 + 2 = 8.

Step 2: Add the two tens' place digits: 3 + 4 = 7.

Step 3: The sum of the ones' place digits is less than 10.

Therefore answer is 78.

Step 2: Add the two tens' place digits: 3 + 4 = 7.

Step 3: The sum of the ones' place digits is less than 10.

Therefore answer is 78.

Step 1: Add the two ones' place digits: 4 + 9 = 13.

Step 2: Add the two tens' place digits: 8 + 4 = 12.

Step 3: The sum of the ones' place digits is a two-digit number so decrease the ones' place sum by 10: 13 - 10 = 3 and

increase the tens' place sum by 1: 12 + 1 = 13.

Step 4: Combine the tens' and ones' place sums.

Answer is 133.

Below are the examples on** mental math subtraction**

Step 1: Subtract the two tens' place digits: 7 - 2 = 5

Step 2: Bottom one's digit is larger than the top one's digit.Decrease the answer for the tens' place by 1: 7 - 1 = 6 and

increase the top ones place value by 10: 5 + 10 = 15.

Step 3: Subtract the two ones' place values: 15 - 6 = 9

Step 4: Combine the tens' and ones' place value.

Answer is 49.

Step 1: Subtract the two tens' place digits: 8 - 5 = 3

Step 2: Subtract the two ones' place digits: 5 - 3 = 2

Step 3: Combine the tens' and ones' place value.

Answer is 32.

Below are the examples on

Step 1: Multiply the one's digit by 6, 6 x 5 = 30

Step 2: Multiply the ten's digit by 6, 6 x 3 = 18

Step 3: Product of one's place is two digit 30, so add the ten's digit into 18, 18 + 3 = 21

Step 4: Combine the one's and two's place value

Answer is 210.

Step 1: Multiply the one's digit by 4, 6 x 4 = 24

Step 2: Multiply the ten's digit by 4, 5 x 4 = 20

Step 3: Product of one's place is two digit 24, so add the ten's digit into 20, 20 + 2 = 22

Step 4: Combine the one's and two's place value

Answer is 224

Step 1: Divide the ten's digit by 7, $\frac{8}{7}$ = 1 with remainder 1

Step 2: Multiply 1 by 10, 1 x 10 = 10 and add it to one's place, 10 + 4 = 14

Step 3: Divide 14 by 7, $\frac{14}{7}$ = 2

Step 4: Combine the one's and two's place values

Answer is 12.

Step 1: Divide the ten's digit by 9, $\frac{9}{6}$ = 1 with remainder 3

Step 2: Multiply 3 by 10, 3 x 10 = 30 and add it to one's place, 30 + 6 = 36

Step 3: Divide 36 by 6, $\frac{36}{6}$ = 6

Step 4: Combine the one's and two's place values

Answer is 16

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