The Dairy Farm

Place the digits 2, 5, and 3 appropriately to get a product close to 100. Share your reasoning in class.

A dairy has packed butter milk pouches in the following manner. Find the number of pouches kept in each arrangement. One is done for you. $30 \times 2$ = 60. ___ × ___ = 60

Let us revise multiplication by 10s and 100s. a) $4 \times 10$ = ___ b) $20 \times 10$ = ___ c) $10 \times 40$ = ___ d) $10 \times 10$ = 100 e) $20 \times 50$ = ___ f) $80 \times 10$ = ___ g) $3 \times 100$ = $100 \times 3$ = 300 h) $8 \times 100$ = ___ = ___ i) $10 \times 100$ = ___ = ___

Find answers to the following questions. Fill in the table below and describe the pattern. $100 \times 90$ = ___,000; $400 \times 10$ = ___; $60 \times 50$ = ___; $30 \times 20$ = 600; $700 \times 4$ = ___,000; $10 \times 45$ = ___. How should we write 450 in the table below?

Let us fill in the table and observe the patterns. Complete the tables for: $2 \times 1$,000 = ___; $5 \times 1$,000 = ___; $10 \times 1$,000 = ___; $20 \times 1$,000 = ___; $3 \times 5$,000 = ___; $8 \times 3$,000 = ___; $5 \times 7$,000 = ___. Also complete: $20 \times 100$ = ___; $40 \times 500$ = ___; $60 \times 300$ = ___; $600 \times 30$ = ___; $80 \times 900$ = ___; $70 \times 600$ = ___; $5 \times 7$,000 = ___.

What is $18 \times 5$? Do you think they are all correct? Why do you think so?

This halving and doubling strategy works well when we have to multiply with numbers like 5 and 25. Discuss why?

Find the product by halving and doubling either the multiplier or the multiplicand. 1) $5 \times 18$ 2) $50 \times 28$ 3) $15 \times 22$ 4) $25 \times 12$ 5) $12 \times 45$ 6) $16 \times 45$

Give 5 examples of multiplication problems where halving and doubling will help in finding the product easily. Find the products as well.

Give 5 examples of problems where you can use the nearest multiple to find the product easily. Find the products as well.

Find the products of the following numbers by finding the nearest multiple. 1) $7 \times 52$ 2) $12 \times 28$ 3) $75 \times 31$ 4) $99 \times 15$ 5) $8 \times 25$ 6) $22 \times 42$

A school has an auditorium with 35 rows, with 42 seats in each row. How many people can sit in this auditorium?

Priya jogs 4 kilometres every day. How many kilometres will she jog in 31 days?

A school has received 36 boxes of books with 48 books in each box. How many total books did the school receive in the boxes?

Priya uses 16 metres of cloth to make 4 kurtas. How much cloth would she need to make 8 kurtas?

Gollappa has 29 cows on his farm. Each cow produces 5 litres of milk per day. How many litres of milk do the cows produce in total, each day?

Maska Cow Farm has 297 cows. Each cow requires 18 kg of fodder per day. How much total fodder is needed to feed 297 cows every day?

A family of 4 produces around 35 kg of kitchen waste in a month. How much waste will the family produce in a year? The family produces ___ kg of waste in a year.

The family regularly composts the collected waste. They get around 150 kg of compost each year, which they use in their garden. 1 kg of compost is often sold in the market at ₹24. By creating their own compost, how much money have they saved in a year?

Solve the following problems like Nida did. a) $78 \times 4$ b) $83 \times 9$ c) $67 \times 28$ d) $53 \times 37$