Eyepieces: The eyepieces are the lenses at the top that the viewer looks through Tube: Where the eyepieces are dropped in. Also, they connect the eyepieces to the objective lenses. Base: The bottom of the microscope-what the microscope stands on. Arm: Structural element that connects the head of the microscope to the base. Stage: The flat platform that supports the slides. Stage clips hold the slides in place. You can move the stage up and down using the adjustment knobs Objective Lenses: Usually you will find 3 or 4 objective lenses on a microscope. The most common ones are \( 4 X \) (shortest lens), \( 10 X, 40 X \) and 100 X (longest lens)

Calculation techniques a) Estimate and calculate (find the error) a. \( 4260+57218+842+9168 \) Estimate:

(d) \( 15 t-((3 t-6 u)-v)-(5 u-(20 t+4 v))= \)

Find the missing number in the box. \( 4: 14: 6=14: \square: 21 \)

3. I lie between 30 and 40 . When I am divided by 5 , there is a remainder of 3 . Who am 1 ? 4. If 74 apples are packed equally in 9 boxes. Then how many apples will be there in each box? How many apples will remain unpacked? 5. How many ₹ 10 are there in \( ₹ 93 \) ? How many ₹ 1 are left? 6. Iie between 50 and 60 . When 1 am divided by 7 , there is a remainder of 1 . 7. The class teacher has bought 75 notebooks. If she gives each child 4 notebooks, then how many children can she distribute notebooks? How many notebooks will remain undistributed?

3. Perhatikan panjang sisi-sisi segitiga berikut! (1) \( 4 \mathrm{~cm}, 6 \mathrm{~cm}, 8 \mathrm{~cm} \) (2) \( 6 \mathrm{~cm}, 8 \mathrm{~cm}, 10 \mathrm{~cm} \) (3) \( 6 \mathrm{~cm}, 8 \mathrm{~cm}, 14 \mathrm{~cm} \) (4) \( 10 \mathrm{~cm}, 24 \mathrm{~cm}, 26 \mathrm{~cm} \) Sisi segitiga yang memenuhi tripel Pythagoras ditunjukkan nomor ... a. (1) dan (2) b. (1) dan (3) c. (2) dan (4) d. (3) dan (4)