به انگلیسی

Taking away tens

ریاضی · جمع و تفریق · سن ۶ تا ۷ سال

نام ______________________ تاریخ ____________

What is 90 − 60?
- 20
- 30
- 40
What is 90 - 40?
- 40
- 60
- 30
- 50
What is 80 - 50?
پاسخ: ______________
What is 70 − 30?
- 30
- 40
- 50
40 + 30 = 70, so 70 - 40 = 30. Is that right?
دور یکی دایره کشیدن: درست نادرست
50 - ? = 20. What is the missing number?
- 30
- 20
- 40
- 10
What is 100 - 60?
پاسخ: ______________
What is 50 − 20?
- 40
- 20
- 30
Mia solves 90 − 60 and writes 3. What went wrong?
- She forgot to put the zero back after subtracting the tens digits
- She subtracted the wrong tens digits
- She added instead of subtracting
With blocks, 8 ten-sticks take away 5 ten-sticks leaves 3 ten-sticks, so 80 - 50 = 30. Is that right?
دور یکی دایره کشیدن: درست نادرست

پاسخ‌نامه

برای بزرگ‌ترها. تا کردن این صفحه پیش از تحویل بقیه.

30 · Nine tens minus six tens is three tens, so 90 − 60 = 30.
50 · 9 tens take away 4 tens leaves 5 tens.
30 · 8 tens take away 5 tens leaves 3 tens.
40 · Seven tens minus three tens is four tens, so 70 − 30 = 40.
درست · Right: the addition fact gives the subtraction.
30 · 5 tens take away some leaves 2 tens, so 3 tens.
40 · 10 tens take away 6 tens leaves 4 tens.
30 · Five tens minus two tens is three tens, so 50 − 20 = 30.
She forgot to put the zero back after subtracting the tens digits · Nine tens minus six tens is three tens, which is 30. Mia dropped the zero, so the real answer is 30.
درست · Right: 8 - 5 = 3 sticks, each worth ten.