Question

look at the number sentences below 1+2+3+___+80=3240 71+72+___+80=755 what is the sum of the numbers from 1 to 70

Answer 1

Examples. A valid number sentence that is true: 3+10=13. A valid number sentence that is false: 1 + 1 = 3. A valid number sentence using a 'less than' symbol: 3 + 6 < 10.