Q1.
Fill in the blanks to make the expressions equal on both sides of the = sign: (a) 13 + 4 = ____ + 6 (b) 22 + ____ = 6 × 5 (c) 8 × ____ = 64 ÷ 2 (d) 34 – ____ = 25
Answer
Find the value of the side that is complete, then work backwards on the other side.
(a) 13 + 4 = 17, so ___ + 6 = 17 → ___ = 17 – 6 = 11
13 + 4 = 11 + 6
(b) 6 × 5 = 30, so 22 + ___ = 30 → ___ = 30 – 22 = 8
22 + 8 = 6 × 5
(c) 64 ÷ 2 = 32, so 8 × ___ = 32 → ___ = 32 ÷ 8 = 4
8 × 4 = 64 ÷ 2
(d) 34 – ___ = 25 → ___ = 34 – 25 = 9
34 – 9 = 25
13 + 4 = 11 + 6
(b) 6 × 5 = 30, so 22 + ___ = 30 → ___ = 30 – 22 = 8
22 + 8 = 6 × 5
(c) 64 ÷ 2 = 32, so 8 × ___ = 32 → ___ = 32 ÷ 8 = 4
8 × 4 = 64 ÷ 2
(d) 34 – ___ = 25 → ___ = 34 – 25 = 9
34 – 9 = 25
Why it happens: The ‘=’ sign does not mean “write the answer here”. It means both sides have the same value. So we first find the value of the complete side and then choose the missing number that gives that same value.
Check it yourself: Put your answers back in — 11 + 6 = 17 ✓, 22 + 8 = 30 ✓, 8 × 4 = 32 ✓, 34 – 9 = 25 ✓.