Darab dan bahagi berkaitan = 乘除互相关联 一个乘法事实可以变出两个除法事实。6 × 4 = 24,所以 24 ÷ 6 = 4,24 ÷ 4 = 6。三个数是一家人:24 是最大的数,放在除号前面。 例子:3 × 7 = 21,所以 21 ÷ 3 = 7,21 ÷ 7 = 3。 注意:写除法时最大的数要放在最前面,不能写成 4 ÷ 24。
Darab dan bahagi berkaitan = Multiplication and division are linked One multiplication fact gives two division facts. Since 6 × 4 = 24, we know 24 ÷ 6 = 4 and 24 ÷ 4 = 6. The three numbers form a family, and the biggest one goes first in a division. Example: 3 × 7 = 21, so 21 ÷ 3 = 7 and 21 ÷ 7 = 3. Watch out: The biggest number goes first; writing 4 ÷ 24 is not the same.
Langkah 2
Gunakan sifir yang tepat
Untuk 42 ÷ 7, cari fakta sifir 7 yang menghasilkan 42.
Sifir yang tepat = Use the right table For 42 ÷ 7, use the table of 7, the divisor. Count along it: 7, 14, 21, 28, 35, 42. Forty-two is the sixth number, so 6 × 7 = 42 and 42 ÷ 7 = 6. Example: 32 ÷ 8: the table of 8 goes 8, 16, 24, 32; 32 is the fourth, so 32 ÷ 8 = 4. Watch out: Use the table of the divisor; another table will not help.
Langkah 3
Semak tiga nombor
Pastikan nombor asal, pembahagi dan jawapan membentuk fakta darab yang betul. Pada garis nombor, 15 ÷ 3 = 5 ialah lima lompatan 3 ke belakang. Bahagi juga boleh ditulis dalam bentuk lazim.
Semak tiga nombor = Check the three numbers In a division, the starting number, the divisor and the answer must make a true multiplication: answer × divisor = starting number. If that multiplication is wrong, the division answer is wrong too. This check takes just one multiplication. Example: 30 ÷ 5 = 6. Check: 6 × 5 = 30, so the three numbers fit. Watch out: If the check is too big, make the answer smaller; if too small, make it bigger.
Semak cepat · Soalan 1 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Bahagi dengan 6 = Divide by 6 The question asks for 24 ÷ 6, which shares 24 into 6 equal parts. You can also ask what number times 6 makes 24. Count up the table of 6: 6, 12, 18 and onward, and see how many steps it takes to reach 24. Example: 18 ÷ 6 = 3, because 6, 12, 18 is three steps. Watch out: The first step is 6 itself; do not count the starting zero as a step.
Semak cepat · Soalan 2 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Bahagi dengan 5 = Divide by 5 The question asks for 35 ÷ 5, so find what number times 5 makes 35. Skip count in fives: 5, 10, 15, 20, 25, 30, 35, and count how many numbers you said. Multiples of 5 end in 0 or 5, so 35 is in the table of 5. Example: 40 ÷ 5 = 8, because 8 × 5 = 40. Watch out: Do not skip any number while counting, or you will be one step short.
Ringkasan
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Ingat: darab dan bahagi berkaitan; gunakan sifir yang tepat; semak tiga nombor.