Let’s solve each part step by step.
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1. Add.
(a)
We are shown 10 apples on the left and 5 apples on the right.
So, 10 + 5 =
15
(b)
We are shown two groups of sticks — each group has 10 sticks.
So, 10 + 10 =
20
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2. Fill in the missing numbers.
(a)
Top box is 18. One bottom box is 8. We need to find what number plus 8 makes 18.
18 - 8 =
10 → So the missing number is
10
(b)
Top box is 15. One bottom box is 10. What number plus 10 makes 15?
15 - 10 =
5 → Missing number is
5
(c)
“14 is ___ and 4.”
That means: ? + 4 = 14 → 14 - 4 =
10 → So, 14 is
10 and 4.
(d)
“12 is 10 and ___.”
That means: 10 + ? = 12 → 12 - 10 =
2 → So, 12 is 10 and
2.
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Fill in the missing number (number sequences):
(a)
Sequence: 11, __, 13, 14
Numbers go up by 1 each time. After 11 comes
12, then 13, then 14.
Missing number:
12
(b)
Sequence: 17, 18, __, 20
After 18 comes
19, then 20.
Missing number:
19
(c)
Sequence: 16, 15, __, 13
Going down by 1 each time. After 15 comes
14, then 13.
Missing number:
14
(d)
Sequence: 12, 14, __, 18
From 12 to 14 is +2. Then from 14 to next should be +2 → 16. Then 16 to 18 is +2.
So missing number:
16
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Final Answer:
1. (a) 15
(b) 20
2. (a) 10
(b) 5
(c) 10
(d) 2
Fill in the missing number:
(a) 12
(b) 19
(c) 14
(d) 16
Parent Tip: Review the logic above to help your child master the concept of mathematics for grade 1 worksheet.
