Use knowledge of number bonds and place value to subtract. Avoid counting on. Use questioning to help. How many tens in 40? What is one ten less? What is 10-2? 30 and 2 make? 40 2 =___ – 30 4 =___ – 20 - 1 =___ 30 5 =___ – 40 3 =___ – 20 - 6 =___ 40 - 7 = ___ 30 9 =___ – 20 2 =___ – 30 8 =___ – 40 1 =___ – 20 3 =___ –
Use knowledge of number bonds and place value to subtract. Avoid counting on. Use questioning to help. How many tens in 40? What is one ten less? What is 10-2? 30 and 2 make? 40 – 2 =___ 30 – 4 =___ 20 - 1 =___ 30 – 5 =___ 40 – 3 =___ 20 - 6 =___ 40 - 7 = ___ 30 – 9 =___ 20 – 2 =___ 30 – 8 =___ 40 – 1 =___ 20 – 3 =___