1. (10 × 24 - 20) ÷ 22= N
(240 - 20) ÷ 22 = N
(220 ÷ 22) = N
10 = N
Solution: N = 10
2. Same with problem 1.
3. (45 × 63) + (900 ÷ 36) = N
(2835 + 25) = N
(2860 = N)
Solution: N = 2860
4. (12 500 - 750) ÷ 125 + 6 = N
11750 ÷ 125 + 6 = N
94 + 6 = N
100 = N
Solution: N = 100
5. (78 × 945) + 4200 - (500 + 410) = N
73710 + 4200 - 910 = N
77000 = N
Solution: N = 77000
