The calculation method of decimal multiplication is: first, according to the calculation method of integer multiplication, after obtaining the product, look at how many decimal places there are in the two factors * * *, and then count the digits from right to left in the multiplied product and point the decimal point.
The calculation method of fractional division is: first, according to the invariant property of quotient, the divisor is changed into an integer, and then it is calculated according to the calculation method of integer division, but it should be noted that the decimal point of quotient should be aligned with the decimal point of dividend.
Question 2: How to write 30 numbers to calculate the answer of decimal multiplication in grade four, and sort out the numbers in the question and answer?
Question 3: How to write 30 calculation methods of grade four score multiplication? There is also the answer (1), 26×4-25÷( 125÷25)=99(2), 13+7× 2-8 = 19. 63-7+8÷4=58(7) 16×2÷4+3= 1 1(8)9 1+9× 100=99 1(9)4 1×7÷2= 143.5( 10)88- 12+ / kloc-0/2×2= 100(65438 +0 1)78×50- 1440÷ 12=3780( 12)3856÷ 16+85× 16= 160 1( 13) 4000÷( 16+832÷ 13)=50( 14)(326+95× 25)÷37=73( 15)(7236÷ 18-228)×28=4872( 16)(4275-24×75)÷25=99( 17) 45+ 15×6= 135( 18)6×5÷2×4=60( 19)30×3+8=98(20)4 00÷4+20= 120(2 1) 10+ 12÷3= 14(22) (80÷20+80)÷4=2. 170+( 100- 10×5) = 120360÷40=940×20=80080-25=5570+45= 1 1590×2= 180 1 6×6=96300×6= 1800540÷9=6030×20=600400÷4= 100350-80=270 160+70=230 18-64÷8= 1042÷6+20=2740-5×7=5
Question 4: How to calculate a decimal number 15× 10= 1 by the fourth grade decimal multiplication and division method? The original decimal number will be expanded by 10 times.
For example, 0, which means 0: a decimal point. 15 shifts one decimal point to the right, and becomes1.015.5.15 ÷ 10 = 0, that is, 0, and the original decimal point is reduced by10 times.
If it is 0.5, enlarge the original decimal by 10 times.
Instead, the decimal point moves one place to the left. 15 shifts one place to the left to become 0.0 15 and shifts one place to the right.
Question 5: How to check decimal multiplication in grade four? The calculation method is the same as integer multiplication, and it is calculated by division (dividing the product by a factor); Or use multiplication (exchange the positions of two factors) to check.
Question 6: There are 200 vertical arithmetic problems of decimal multiplication in the fourth grade of primary school, which are 3.5 * 7.55 3.98 * 0.12 99.999 *10.45.16 * 8.9910/kloc. 2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1*6.64 1. 1*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 16*8.99 1.0 1*3. 1 1 8.8*22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1* 6.64 1. 1*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 16*8.99 1.0 1*3. / kloc-0/ 1 8.8* 22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1*6.64 1. 1*0 65.37*77.88 3. 1 4×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 16*8.99 1.0 1*3. 1 1 8.8*22.98 36.4*2. 1 32. 1 *6.57 5.78*7.4 37.6*2.6 67.2 1* 6.64 1. 1*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 1 6*8.99 1.0 1*3. 1 1 8.8* 22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1*6.64 1. / kloc-0/*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 16*8.99 1.0 1*3. 1 1 8.8* 22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1* 6.64 1. 1*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. / kloc-0/2 99.999* 1.4 5. 16*8.99 1.0 1*3. 1 1 8.8* 22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6* 2.6 67.2 1*6.64 1. 1*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 16*8.99 1.0 / kloc-0/*3. 1 1 8.8*22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1* 6.64 1. 1*0 65.37*77.88 3. / kloc-0/4×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. 16*8.99 1.0 1*3. 1 1 8.8* 22.98 36.4*2. 1 32. / kloc-0/*6.57 5.78*7.4 37.6*2.6 67.2 1*6.64 1. 1*0 65.37*77.88 3. 14×3 3.5*7.55 3.98*0. 12 99.999* 1.4 5. / kloc-0/6*8.99 1.0 1*3. 1 1 8.8*22.98 36.4*2. 1 32. 1*6.57 5.78*7.4 37.6*2.6 67.2 1*6.64 1. 1*0 65.37*77.88 3. 14×3