Sexto de primaria - Operaciones con decimales (sumas y restas) y números decimales.
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CHAPTER 4 DECIMALS NOTE OF DECIMALS
1. PLACE VALUE EXAMPLE: 5.264 PLACE VALUE
VALUE OF DIGIT
THOUSANDTHS HUNDREDTHS
0.004 0.06
TENTHS
0.2
2. Rounded off Example: Decimal 4.7871
thousandth 4.787
To the nearest hundredth 4.79
3. Calculation o Decimal (a) First- Carry out calculation in bracket (b) Second- Carry out × or ÷ from the left (c) Third - Carry out + or − from the left
tenth 4.8
QUESTION OF DECIMALS
1. Round off 56.47 to the nearest tenth.
2. State the value of digit 9 in 12.92.
3.
45 100
+
7 1000
−
15 100
=
4. 2 − 0.2 + 0.02 =
5. 0.17 × 23 =
6.
7.
8.
9.
2.25 0.025
4 7
=
× 0.98 ÷ 0.4 =
1.69 0.13
30 0.06
3
− × 0.1 = 8
÷
0.08 0.4
=
⎛ 1 2 ⎞ + ⎟ and express the answer as a decimal. 4 5 ⎠ ⎝
