Question

Calculează, după model:
a) 4 x 14 = 4 x (10 + 4) = 4 x 10+4×4=40+16=56
5 x 16 =
6 x 12 =
b) 3 x 24 = 3 (20 + 4) = 3 x(10+10+4)=3×10+3×10+3×4=30+30+12=72
4 x 22 =
7x23=
c) 5 x 123 = 5 x (100 + 20+3)=5×100+5×20+5×3=500+100+15=615 4×234= 6×142​

Answer 1

Explicație pas cu pas:

a) 4 × 14 = 4 × (10 + 4) = 4 × 10 + 4 × 4 = 40 + 16 = 56

5 × 16 = 5 × (10 + 6) = 5 × 10 + 5 × 6 = 50 + 30 = 80

6 × 12 = 6 × (10 + 2) = 6 × 10 + 6 × 2 = 60 + 12 = 72

b) 3 × 24 = 3 × (20 + 4) = 3 × (10 + 10 + 4) = 3 × 10 + 3 × 10 + 3 × 4 = 30 + 30 + 12 = 72

4 × 22 = 4 × (20 + 2) = 4 × (10 + 10 + 2) = 4 × 10 + 4 × 10 + 4 × 2 = 40 + 40 + 8 = 88

7 × 23 = 7 × (20 + 3) = 7 × (10 + 10 + 3) = 7 × 10 + 7 × 10 + 7 × 3 = 70 + 70 + 21 = 161

c) 5 × 123 = 5 × (100 + 20 + 3) = 5 × 100 + 5 × 20 + 5 × 3 = 500 + 100 + 15 = 615

4 × 234 = 4 × (200 + 30 + 4) = 4 × 200 + 4 × 30 + 4 × 4 = 800 + 120 + 16 = 936

6 × 142 = 6 × (100 + 40 + 2) = 6 × 100 + 6 × 40 + 6 × 2 = 600 + 240 + 12 = 852