7. Two elifferent sized fars of jam are sold at the followimg prices: A: 500 g for K 8,50 or B: 750 it for R 11,50. Which sire is the better buy? B. Do these Falculations witheut a calculator: a) $$ 240,01 imes 100 $$ b) $$ 36-4,5 imes 1000 $$ c) $$ 1865,03 imes 10 $$ c) $$ 990,11 imes 1000 $$ c) $$ 5,298 imes 100 $$ ก) $$ 6995,86+1000 $$ k) $$ 3754,41+100 $$ h) $$ 788,1+1000 $$

Question

7. Two elifferent sized fars of jam are sold at the followimg prices: A: 500 g for K 8,50 or B: 750 it for R 11,50. Which sire is the better buy? B. Do these Falculations witheut a calculator: a) $$ 240,01 	imes 100 $$ b) $$ 36-4,5 	imes 1000 $$ c) $$ 1865,03 	imes 10 $$ c) $$ 990,11 	imes 1000 $$ c) $$ 5,298 	imes 100 $$ ก) $$ 6995,86+1000 $$ k) $$ 3754,41+100 $$ h) $$ 788,1+1000 $$

UpStudy AI · Accepted Answer

**7. Comparing the two sizes of jam**

For jar A, the price per gram is  
$$
\frac{8.50}{500} = 0.017 \text{ per gram.}
$$

For jar B, the price per gram is  
$$
\frac{11.50}{750} \approx 0.01533 \text{ per gram.}
$$

Since $$0.01533 < 0.017$$, jar B offers a lower cost per gram and is the better buy.

---

**B. Calculations without a Calculator**

a) Multiply $$240.01 \times 100$$:  
Multiplying by 100 shifts the decimal point two places to the right, so  
$$
240.01 \times 100 = 24001.
$$

b) Compute $$36 - 4.5 \times 1000$$:  
First, calculate the multiplication:  
$$
4.5 \times 1000 = 4500.
$$  
Then subtract:  
$$
36 - 4500 = -4464.
$$

c) Multiply $$1865.03 \times 10$$:  
Multiplying by 10 shifts the decimal one place to the right, giving  
$$
1865.03 \times 10 = 18650.3.
$$

d) Multiply $$990.11 \times 1000$$:  
Multiplying by 1000 shifts the decimal three places to the right, so  
$$
990.11 \times 1000 = 990110.
$$

e) Multiply $$5.298 \times 100$$:  
Multiplying by 100 shifts the decimal two places, therefore  
$$
5.298 \times 100 = 529.8.
$$

f) Add $$6995.86 + 1000$$:  
$$
6995.86 + 1000 = 7995.86.
$$

g) Add $$3754.41 + 100$$:  
$$
3754.41 + 100 = 3854.41.
$$

h) Add $$788.1 + 1000$$:  
$$
788.1 + 1000 = 1788.1.
$$
**7. Comparing Jam Sizes** Jar B is the better buy because it has a lower cost per gram. --- **B. Calculations Without a Calculator** a) $$240.01 \times 100 = 24001$$ b) $$36 - 4.5 \times 1000 = -4464$$ c) $$1865.03 \times 10 = 18650.3$$ d) $$990.11 \times 1000 = 990110$$ e) $$5.298 \times 100 = 529.8$$ f) $$6995.86 + 1000 = 7995.86$$ g) $$3754.41 + 100 = 3854.41$$ h) $$788.1 + 1000 = 1788.1$$

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