fractions (part 1) - sap education...learning maths book 5a fractions (part 1) convert the following...
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P5 MATHS
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SAPMATP5_W10Page 1/4
Taken from Learning Maths Book 5A
Fractions (Part 1)
Convert the following fractions to decimals. Round off your answer to 2 decimal places.
1. 5___ 20 =
2. 4__ 7 ≈
3. 6 2__ 9 ≈
Solutions: 1. 0.25
5 __ 20 = 25 ___100 = 0.25
2. 0.57 4.00.571
7–35
50–49
10– 7
3
4 _ 7 = 4 ÷ 7= 0.571≈0.57
3. 6.22 2.00.222
9–18
20–18
20–18
2
2 _ 9 = 2 ÷ 9 ≈ 0.222
62 _ 9 ≈ 6 + 0.22 = 6.22
P5 MATHS
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SAPMATP5_W10Page 2/4
Taken from Learning Maths Book 5A
Fractions (Part 1)
Add the mixed numbers. Express your answer in its simplest form.
1. 2 7__ 8 +1 1__ 3 =
2. 4 4__ 9 +1 3__ 4 =
3. 10 2__ 5 +3 2__ 7 =
1. 4 5 __ 24
27 _ 8 + 11 _ 3 = 221 __ 24 + 18 __ 24
= 329 __ 24
= 45 __ 24
Solutions: 2. 67 __ 36
44 _ 9 + 13 _ 4 = 416 __ 36 + 127 __ 36
= 543 __ 36
= 67 __ 36
3. 1324 __ 35
10 2 _ 5 + 3 2 _ 7 = 10 14 __ 35 + 3 10 __ 35
= 13 24 __ 35
P5 MATHS
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SAPMATP5_W10Page 3/4
Taken from Learning Maths Book 5A
Fractions (Part 1)
Subtract the mixed numbers. Express your answer in its simplest form.
1. 5 3__ 5 –1 3___ 10 =
2. 4 9___ 10 –2 2__ 3 =
3. 6 3___ 11 –3 1__ 2 =
1. 4 3 __ 10
53 _ 5 – 13 __ 10 = 5 6 __ 10 – 13 __ 10
= 4 3 __ 10
2. 2 7 __ 30
4 9 __ 10 – 2 2 _ 3 = 4 27 __ 30 – 2 20 __ 30 = 2 7 __ 30
3. 217 __ 22
6 3 __ 11 – 3 1 _ 2 = 6 6 __ 22 – 3 11 __ 22
= 5 28 __ 22 – 3 11 __ 22
= 2 17 __ 22
Press C 6 ab/c 3 ab/c 1 1 – 3 ab/c 1 ab/c 2 =
Solutions:
P5 MATHS
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SAPMATP5_W10Page 4/4
Taken from Mental Mathematics Book 5
STRATEGY
Solutions: 1. 675 2. 435 3. 1005 4. 1380 5. 510 6. 255 7. 1290 8. 315 9. 1350 10. 1095
Do these sums mentally.
1. 45×15=
2. 29×15=
3. 67×15=
4. 92×15=
5. 34×15=
6. 17×15=
7. 86×15=
8. 21×15=
9. 90×15=
10. 73×15=
Findthevalueof78×15.
78×15=(78×10)+(78×5) [Since(78×5)ishalfof(78×10),dividetheresult =780+390 of(78×10)by2] =1170
Mental Maths: Multiplying Numbers by 15