7th Mathematics Weekly Test - 3 (Number System)

St. Britto Hr. Sec. School - Madurai

7th Mathematics Weekly Test - 3 (Number System)-Aug 2020

Time : 1.00 Hours

Part - A

Generic 2 - Answer All Question

An elevator descends into a mine shaft at the rate of 5 m/min. If the descent starts from 15 m above the ground level, how long will it take to reach –250 m?

Find the product of
(i) (-35)×22 (ii) (-10)×12×(-9) (iii) (−9)×(−8)×(−7)×(-6)
(iv) (-25)×0×45×90 (v) (-2)×(+50)×(-25)×4

When Kala woke up, her body temperature was 102°F. She took medicine for fever. After 2 hours it was 2°F lower. What was her temperature then?

Thenmalar appeared for competitive exam which has negative scoring of 1 mark for each incorrect answer. In paper I she answered 25 questions incorrectly and in paper II, 13 questions incorrectly. Find the total reduction of marks.

In a quiz competition, Team
A scored +30,–20, 0 and team B scored –20, 0, +30 in three successive rounds. Which team will win? Can we say that we can add integers in any order?

Part - B

Generic 5 - Answer All Question

Prove that (–7) × (+8) is an integer and mention the property.

Prove that [(–2) × 3] ×(–4) = (–2) ×[3×(–4)].

What is the balance in Chezhiyan’s account as a result of a purchase for ₹ 1079, if he had an opening balance of ₹ 5000 in his account?

Subtract the following using the number line.
(i) –3 – (–2) (ii) +6 – (–5)

Find the value of :(i) (-11) - (-33) (ii) (-90)-(-50)

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7th Mathematics Weekly Test - 3 (Number System)

St. Britto Hr. Sec. School - Madurai

7th Mathematics Weekly Test - 3 (Number System)-Aug 2020

Part - A

Generic 2 - Answer All Question

An elevator descends into a mine shaft at the rate of 5 m/min. If the descent starts from 15 m above the ground level, how long will it take to reach –250 m?

Find the product of (i) (-35)×22 (ii) (-10)×12×(-9) (iii) (−9)×(−8)×(−7)×(-6) (iv) (-25)×0×45×90 (v) (-2)×(+50)×(-25)×4

When Kala woke up, her body temperature was 102°F. She took medicine for fever. After 2 hours it was 2°F lower. What was her temperature then?

Thenmalar appeared for competitive exam which has negative scoring of 1 mark for each incorrect answer. In paper I she answered 25 questions incorrectly and in paper II, 13 questions incorrectly. Find the total reduction of marks.

In a quiz competition, Team A scored +30,–20, 0 and team B scored –20, 0, +30 in three successive rounds. Which team will win? Can we say that we can add integers in any order?

Part - B

Generic 5 - Answer All Question

Prove that (–7) × (+8) is an integer and mention the property.

Prove that [(–2) × 3] ×(–4) = (–2) ×[3×(–4)].

What is the balance in Chezhiyan’s account as a result of a purchase for ₹ 1079, if he had an opening balance of ₹ 5000 in his account?

Subtract the following using the number line. (i) –3 – (–2) (ii) +6 – (–5)

Find the value of :(i) (-11) - (-33) (ii) (-90)-(-50)

Comment

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Find the product of
(i) (-35)×22 (ii) (-10)×12×(-9) (iii) (−9)×(−8)×(−7)×(-6)
(iv) (-25)×0×45×90 (v) (-2)×(+50)×(-25)×4

In a quiz competition, Team
A scored +30,–20, 0 and team B scored –20, 0, +30 in three successive rounds. Which team will win? Can we say that we can add integers in any order?

Subtract the following using the number line.
(i) –3 – (–2) (ii) +6 – (–5)