I'll just fill in1.100cm = () m26m+15m = () m.
22cm+8cm = () cm 95m- 16m = () m。
4 m +28 m = () m
2. Fill in the appropriate units in the brackets.
(1) A building is about 18 (), (2) Xiaohong is about 145 ().
(3) A wooden bed is 2() (4) The classroom is 9 ()
There are () angles and () right angles on a triangle.
4. The number less than 20 times 5 is (), and the number 20 times 5 is ().
5.5+5+5+5 is rewritten as multiplication formula () or (), and the formula is ().
6. The units of length are () and ().
In the second grade math contest, I can calculate 38-7= 43+8= 7 1-6= 58+8=
3? 4= 5? 3= 2? 6= 4? 6=
4+30= 70-30= 6? 5= 3? 6=
Third, judge 1. The longer the side of an angle, the bigger the angle. ( )
Multiply 2.6 by 3 to write 6? 3, pronunciation 3 times 6, the formula is 368. ( )
When two numbers are multiplied, the product must be less than the sum of the two numbers. ( )
The circular track of the school playground is 60 cm long. ( )
5. The height of Xiaojun is 140m. ( )
6. The line segment less than 30cm10cm is 40cm long. ( )
I will choose 1. To measure the width of the street, take () as the unit.
(1) cm (2) m (3) decimeter
2. If the number12 exceeds 39, it is ().
( 1)27 (2)4 1 (3)5 1
3.2+2+2+2-1can be written as ()
( 1)2x 6- 1(2) 1x 4-2(3)2x 3
4.3+3+3+2 can be written as ().
( 1)3x3 (2)3x4 (3)3x3+2
Exercise your head 1. Look at the pictures and fill in the blanks. (6 points)
★ ★ ★ ★ ★
★ ★ ★ ★ ★
★ ★ ★ ★ ★
Addition formula:
Or: multiplication formula: ()? ( )=( )
Read as:
Or: ()? ( )=( )
Reading: the first network of new curriculum standards
2. Fill in the box? & gt？ Or? & lt？ Or? =? . (18)
3+3○9 4+4+4○4? 4 5? 6○6+5
4? 3○2? 6 54-45○2? 4 46+23○70
58cm 1m 96cm 69cm 100cm 1m。
3. Draw a line that is 3 cm shorter than 8 cm. (2 points)
Grade two math contest 6. Use the formula 72-26= 54+39= 68+27= to calculate the following problems.
95-49-46= 19+26+45=
What is the product of (1)4 times 6?
(2) How much is 27 less than 35?
(3) What is the number17 greater than 9?
(4) One factor is 3 and the other factor is 4. What is the product?
The second grade mathematics competition problem 8. Solve mathematical problems in life 1. In the second year, 25 people participated in the sports group and 7 people participated in the science and technology group/kloc-0. How many people are added to the science and technology group, just like the people in the sports group? How many people are there in the two groups?
As shown on the right, the school library has bought new books. How many copies did Yi buy?
26 comic books
25 story books
20 science and technology books