Muaj ob hom kev ntsuas: Asmeskas thiab ntsuas. Kab lus no qhia koj kom nyeem ob qho tib si.
cov kauj ruam
Txoj Kev 1 ntawm 2: Cov Neeg Amelikas Txoj Cai
Kauj Ruam 1. Coj tus kav Asmeskas
Nws yuav tsum muaj tag nrho ntawm 12 ntiv tes cim. Nruab nrab ntawm txhua tus ntiv tes cim, yuav tsum muaj 15 tus cim me.
Kauj Ruam 2. Kawm cov cim "1/16 ntawm ib nti"
Qhov no txhais tau tias muaj 16 ntawm cov cim no ntawm txhua tus ntiv tes cim thiab 192 ntawm lawv ntawm tus kav tag nrho.
Kauj Ruam 3. Kawm cov cim "1/8 ntawm ib nti"
Nyob rau hauv tag nrho muaj 96 ntawm lawv hla tag nrho tus kav.
Kauj Ruam 4. Kawm cov cim "1/4 ntawm ib nti"
Nyob rau hauv tag nrho, muaj 48 ntawm lawv hla tag nrho tus kav.
Kauj Ruam 5. Kawm cov cim "1/2"
Nyob rau hauv tag nrho muaj 24 ntawm lawv hla tag nrho tus kav.
Kauj Ruam 6. Kawm cov cim "ntiv tes"
Tus kav yog ua los ntawm 12 ntawm cov cim no. Cov no yog suav.
Txoj Kev 2 ntawm 2: Metric Ruler
Kauj Ruam 1. Siv tus ntsuas ntsuas
Yuav tsum muaj ko taw hauv nws. Nruab nrab ntawm txhua lub cim cim, yuav tsum muaj 10 tus cim me.
Kauj Ruam 2. Kawm cov cim "1/10 ntawm ib centimeter", lossis cim "millimeter"
Qhov ntawd txhais tau tias muaj 300 ntawm cov cim no ntawm tus kav tag nrho.
Kauj Ruam 3. Kawm cov cim "1/2 centimeter", lossis "5mm" cov cim
Nyob rau hauv tag nrho, muaj 150 ntawm lawv ntawm tus kav tag nrho.
Kauj Ruam 4. Kawm cov cim "centimeter"
Nyob rau hauv tag nrho muaj 30 ntawm lawv hla tus kav. Cov no yog suav.