2. 5.3) Number, operation, and quantitative reasoning . The student
adds, subtracts, multiplies, and divides to solve meaningful
problems. The student is expected to:
a) use addition and subtraction to solve problems involving whole
numbers and decimals
b) use multiplication to solve problems involving whole numbers
c) use division to solve problems involving whole numbers including
the remainder

3. Rules to Adding Decimals
1) If you have a whole number and it does not have a
decimal, you have to add a decimal at the end of the
whole number.
2)ALWAYS line up your decimals.

4. 1. 314 + 783.12
) 1) Add the decimal at the end of the
whole number.
314
314.00
2) Line up the decimals.
+
314.00
783.12
___________
10 97 .12
2.) 578.50 + 243.14
1) Line up the decimals
11
+
578.50
243.14
__________
8 21.64

5. Rules for Subtracting Decimals
1) If you have a whole number and it does not
have a decimal, you have to add a decimal at the
end of the whole number.
2) ALWAYS subtract your small number from
your large number. (Large number - Small
number)
3) ALWAYS line up the decimals.

6. Rule for Multiplying
1) Always start with your last digit from your second
number.

7. 1)
12 x 9
2)
112 x 3
1
X
12
9
10 8
X
112
3
336

8. Rules for Dividing Decimals
1) Large number goes inside the “house”
2) If your quotient does not come out as a decimal
then put the remainder on the side

9. 1)
24 . 3
.
08
3 24
-0
24
-24
00
2)
61 . 5
.
12
5 61
-5
11
- 10
01
R1