Page 77 - Start Up Mathematics_1
P. 77
1 Write the subtraction facts.
(a) 2 + 6 = 8 8 – 6 = 2 8 – 2 = 6
(b) 4 + 1 = 5
(c) 2 + 1 = 3
(d) 3 + 6 = 9
2 Write the addition facts.
(a) 7 – 4 = 3 3 + 4 = 7 4 + 3 = 7
(b) 9 – 2 = 7
(c) 8 – 3 = 5
(d) 6 – 1 = 5
Little Genius!
Write the answer.
(a) 13 – 0 = (b) 14 + 0 = = 0 + 14 (c) 9 – 9 =
Subtracting 2-Digit Number From 3-Digit Number
To subtract a 2-digit number from a 3-digit number, first subtract the ones, then
the tens and finally keep the hundreds. Look at the given example.
H T O H T O H T O
8 6 7 8 6 7 8 6 7
– 2 5 – 2 5 – ↓ 2 5
2 4 2 8 4 2
Step 1: Subtract the ones. Step 2: Subtract the tens. Step 3: Keep the
7 – 5 = 2 6 – 2 = 4 hundreds.
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