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Whole Numbers
Assessment of Whole numbers (1) and (2)
A. Write the numbers in words.
1. 2861 = Two thousand, eight hundred and sixty-one
2. 5903 = Five thousand, nine hundred and three
3. 1097 = One thousand and ninety-seven
4. 9462 = Nine thousand, four hundred and sixty-two
5. 18010 = Eighteen thousand and ten
B. Write the following in numerals.
1. Eleven thousand, six hundred and seventy = 11 670
2. Nine thousand, two hundred and twelve = 9212
3. Three thousand, one hundred and eight = 3108
4. Twenty-three thousand and forty-nine = 23 049
5. Seven thousands three hundreds seven tens = 7370
C. the largest number is.
1. 9001
2. 6600
3. 33 320
D. What is the value of the digit?
1. In 98 543, the digit 9 stands for 90 000.
The place value of 9 is ten thousands.
2. In 67 867, the digit 8 stands for 800.
The place value of 8 is hundreds.
3. In 24 831, the digit 4 stands for 4000.
The place value of 4 is thousands.
E. Round off the numbers.
1. To the nearest ten.
(a) 5634 (b) 9845 (c) 8558
a) 5630
b) 9850
c) 8560
2. To the nearest hundred.
(a) 9890 (b) 23 932 (c) 90 650
a) 9900
b) 23 900
c) 90700
3. To the nearest thousand.
(a) 3099 (b) 57 501 (c) 12 909
a) 3000
b)58 000
c) 13 000
F. Arrange the numbers in decending order.
1. 7909 , 9197 , 9709 , 8879
9709, 9197, 8879, 7909
2. 13 577 , 45 977 , 43 907 , 77 315
77 315, 45 977, 43 907, 13 577
3. 50 980 , 59 999 , 55 099 , 55 900
59 999, 55 900, 55 099, 50 980
G. Do the following.
1. Find the factors of
(a) 13 (b) 32 (c) 27 (d) 48 (e) 60
a) 1 x 13
(1, 13)
b) 1 x 32, 2 x 16, 4 x 8
(1, 2, 4, 8, 16, 32)
c) 1 x 27, 3 x 9
(1, 3, 9, 27)
d) 1 x 48, 2 x 24, 3 x 16, 4 x 12, 6 x 8
(1, 2, 3, 4, 6, 8, 12, 24, 48)
e) 1 x 60, 2 x 30, 3 x 20, 4 x 15, 5 x 12, 6 x 10
(1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60)
2. List the common factors of 24 and 56.
1, 2, 4, 8
3. What are the first 2 common multiple of 4 and 6?
12, 24
Fractions
D. Convert mixed numbers to improper fractions
1) 35 / 82) 17/10
3) 11/3
4) 21/4
5) 9/7
E. Fractions of a set
1)9
2) 10
3) 8
4) 4
5) 6
Decimals
A. Write the following as decimals.
1. Four tens seven ones two tenths = 47.2
2. Six hundreds two ones and three tenths = 602.3
3. Two tens eight tenths four hundredths = 20.84
B. The largest number is.
1. 3.5
2. 62.9
3. 3.3
C. What is the value of the digit?
1. In 9.83, the digit 8 stands for 0.8.
2. In 62.67, the digit 7 stands for 0.07.
3. In 0.21, the digit 2 stands for 0.2.
D. Round off the numbers below.
1. 5.81 is 5.8 when rounded off to 1 decimal place (tenth).
2. 36.16 is 36 when rounded off to the nearest whole number.
3. 23.345 is 23.35 when rounded off to the nearest hundredth (2 decimal places).
E. Fill in the missing numbers.
1. 3 + 0.8 = 3.8
2. 8 + 0.8 + 0.05 = 8.85
3. 12.5 – 4.15 = 8.35
4. 10.2 + 2.62 = 3.6 + 9.22
5. 42 - 10.82 = 46.18 - 15
6. 30.9 + 21.47 = 52.37
7. 23.94 - 5.4 = 18.54
8. 3.01 + 4.82 = 6.02 + 1.81
F. Express the fractions as decimals.
1) 4.6
2) 1.7
3) 3.5
4) 5.125
5) 1.5
H. Fill in the blanks.
1. 0.5 m = 50 cm
2. 1.3 kg = 1300 g
3. 0.74 = 74 hundredths
4. 25.5 cm = 255 mm
5. 3.6 = 36 tenths
6. 4.2 ℓ = 4200 m ℓ
I. Challenging problems.
1. Xin Yu weighs 34.6 kg. Jia Wang is 2.65 kg lighter than Xin Yu and 5 kg lighter than Xian Zhi. Find Xian Zhi's mass.
34.6-2.65kg = 31.95kg
31.95 + 5 = 36.95 kg
Xian Zhi's mass is 36.95kg.
2. A flag pole is 5.82 m long. The carpenter sawed it into 3 pieces of equal length. Find the length of each piece. (Round off to 1 decimal place.)
5.82 ÷ 3 = 1.94
1.94 = 1.9 m (when rounded off to 1 decimal place)
The length of each piece is 2.0m.
4. Ms Lim had 8.2 m of cloth. She used 1.25 m to sew 1 dress. If she sewed 6 dresses, how many metres of cloth had she left?
1.25 x 6 = 7.5
8.2 – 7.5 = 0.7 m
She had 0.7m left.
5. If 8 litres of petrol cost $8.64. How much is 1 litre of petrol?
8.64 ÷ 8 = $1.08
1 litre of petrol cost $1.08.
6. Kassandra bought 2 chickens. One chicken weighed 2.9 kg and the other is 0.4 kg heavier. If the price of the chicken is $0.90 per kg, how much did she pay for the 2 chickens?
2.9 + 0.4 = 3.3 kg (the mass of the heavier chicken)
3.3 + 2.9 = 6.2 kg (total mass of 2 chickens)
6.2 x 0.90 = $5.58
2 Chickens cost $5.58.
7. Xuen Qing had $10. He bought 9 pencils at $0.25 each. He used the rest of his money to buy 5 pens. What is the price of each pen?
9 x 0.25 = 2.25
10 – 2.25 = 7.75
7.75 ÷ 5 = $1.55
Each pen cost $1.55.
Area and Perimeter
1.
Area = 12 x 9 = 108 square cm
Perimeter = 12 + 9 + 12 + 9 = 42 cm
2.
8 x 8 = 64 (each side is 8 cm)
8 + 8 + 8 + 8 = 32 cm
3.
(a) 10 + 5 + 6 + 3 + 4+ 8 = 36cm
(b) 8 x 4 = 32 square cm
5 x 6 = 30 square cm
30 + 32 = 62 square cm
4.
Perimeter = 10 + 8 + 10 + 8 + 5 + 5 = 46 cm
Area
10 x 8 = 80 square cm(Area of ABCH)
5 x 3 = 15 square cm(Area of FEDG)
80 – 15 = 65 square cm
5.
Length = 3 units
2 lengths = 3 x 3 = 6 units
1 breadth = 1 unit
2 breadths = 2 units
6 units+ 2units = 32 cm
32 ÷ 8 = 4
Length = 4 cm x 3 = 12 cm
Breadth = 4 cm
Area = 12 x 4 = 48 square cm
6.
105 x 30 = 3150 square cm
70 x 30 = 2100 square cm
35 x 30 = 1050 square cm
3150 + 2100 + 1050 = 6300 square cm
14 comments:
mr loh.... i think u forget something.... i cant find the FRACTIONS: section G : QUESTION 1 ( e ) ... pls look.... i think u have forgotten that question..... i am not able to corret the question. if that is missing!!! thank you mr loh!!
mr loh i think u have forgotten SECTION G: QUESTION 1: ( e ) pls remember to see that.. thank you MR LOH!! :)
Hi!Mr Low,
I want 2 ask u something.The unit''Whole Numbers''Part(G) Question(E)u didn't write down the answer.
Hi!Mr Low,
Sry 2 disturb u again.The unit ''Whole Numbers'' Part E Question 3(c) have a problem.Can u solve this problem?
Hi!Mr Low,
The unit ''Fractions''Part D Question 3 have a problem.Can u pls solve the problem?
Hi!Mr Low,
The Unit ''Decimals''Part F Question 1 have a problem.Can u pls solve the problem ?
Hey mr loh! Section E ; Question 3; answer for the 'c)' is wrong. It should not be '12900' but it should be '13000' and the answers for the fractions questions are blur and i could not read some of them.so pls see 2 it soon! :@) !
Bye!Bb!
Oh ya! For section G , you forgot to add in the answer for part E(which is the factors of 60). Pls amend the mistakes that u had made. hope there would not be anymore mistakes!:@)!
Hey again.I Spot Another Mistake!!!!!!!!!6_6 The Decimals part,the section'f',question 1)THE answer has no decimal POINT! Hope u would see 2 it again...:@)!
Hey,hey , hey,another mistake that i had found! Challenging problems; area and perimeter; question 3b); 30 + 32 is 62 and not 64!!Pls see to it !!!
Question 4 of the Area and perimeter section , the perimeter is supposed to be 46 as 10+8+8+7+3+5+5=46 and not 36!!!Pls see to it!
Mr. Loh
The answer for F)1 should be 4.6 not 406 as it states ''express the fractions as dicimals''
Mr. Loh
I)2. the answer is 1.94 but the statement below is 1.95=2.0 but it should be 1.94=1.9.
Thank you for spotting the mistakes.
Apologies for not posting them correctly. All mistakes have been corrected.
Thank you.
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