Study the following examples
1. The numbers 2, 3, 5 and 8. 2. The solutions of the equation x 2 - 2x - 15 = 0. 3. The letters of the word "Chase". 4. People living in our locality. 5. The students Mary, Hillary, Catherine. 6. The workers who are absent from the factory. 7. The capital ..
Approximation
We know that the digits of a number, one by one in order from left to right decrease in value rapidly. Let us illustrate it by examples. Mass of a gold ornament is 23.473 g. Round off to (i) two decimal places, (ii) one decimal place. 23.473 g = (2 x 10) + (3 x 1) + The successi..
We know that the digits of a number, one by one in order from left to right decrease in value rapidly. Let us illustrate it by examples. Mass of a gold ornament is 23.473 g. Round off to (i) two decimal places, (ii) one decimal place. 23.473 g = (2 x 10) + (3 x 1) + The successi..There were 10 people standing in a queue. 5 of them left. Choose a num..
There were 10 people standing in a queue. 5 of them left. Choose a number sentence to show the number of people left in the queue. => 10 - 5 = 6 or 10 - 5 = 15 or 10 - 5 = 5 or 10 - 5 = 10 ..
There are 6 pieces of candy in a bag. 3 pieces are eaten. Identify the..
There are 6 pieces of candy in a bag. 3 pieces are eaten. Identify the number sentence used to calculate the number of candies left in the bag. => 3 + 3 = n or 6 = n + 3 or 1 - n = 0 or 6 + 1 = n..
The data corresponding to the number of left handed people of 20 offic..
The data corresponding to the number of left handed people of 20 offices of two cities is as shown. Check out if both the mean values differ significantly for 95% and 98% confidence levels. => means do not differ at 95% and differ at 98% or means do not differ at both ..
An estimated 830,000 people were killed in a flood in India. Identify ..
An estimated 830,000 people were killed in a flood in India. Identify the number in scientific notation. => 9.3 × 10 5 or 8.3 × 10 4 or 8.3 × 10 5 or 8.3 × 10 6..
7 children were playing in a playground. 4 of them left after sometime..
7 children were playing in a playground. 4 of them left after sometime. Choose a number sentence to show the number of children still in the playground. => 7 - 4 = 5 or 7 - 4 = 3 or 7 - 4 = 4 or 7 - 4..
David makes $132 a week. He spent $54. Identify the number sentence to..
David makes $132 a week. He spent $54. Identify the number sentence to calculate the money left with David. => $54 $132 = n or $ 1 3 2 n = $54 or $132+ n = $54 or n + $54 = $132..
Nina had 4 erasers. She gave 2 erasers to her daughter. Choose a numbe..
Nina had 4 erasers. She gave 2 erasers to her daughter. Choose a number sentence to show how many erasers Nina has left. => 4 - 2 = 2 or 4 - 2 = 3 or 4 - 2 = 0 or 4 - 2 = 1..
Joan has 13 stamps and he gave 4 stamps to his brother. He was left wi..
Joan has 13 stamps and he gave 4 stamps to his brother. He was left with 9 stamps. Which number sentence will help him to check his results? => 13 + 9 = 4 or 4 + 13 = 9 or 4 - 9 = 13 or 13 - 4 = 9..
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